scholarly journals A theory of glacier dynamics and instabilities Part 1: Topographically confined glaciers

2021 ◽  
pp. 1-12
Author(s):  
Hsien-Wang Ou
Keyword(s):  
Full Range ◽  
Steady Creep ◽  
Thermal Switch ◽  
Ice Stream ◽  
Glacier Dynamics ◽  
Thermal Switches ◽  
External Conditions ◽  
Quantitative Validation ◽  
Free Parameters ◽  
Lateral Drainage

Abstract We present a theoretical framework that integrates the dynamics of glaciers with and without the topographic confinement. This Part 1 paper concerns the former, which may exhibit surge cycles when subjected to thermal switches associated with the bed condition. With the topographic trough setting the glacier width and curbing the lateral drainage of the meltwater, the problem falls under the purview of the undrained plastic bed (UPB) formalism. Employing the UPB, we shall examine the external controls of the glacial behavior and test them against observations. Through our non-dimensionalization scheme, we construct a 2-D regime diagram, which allows a ready prognosis of the glacial properties over the full range of the external conditions, both climate- and size-related. We first discern the boundaries separating the glacial regimes of steady-creep, cyclic-surging and steady-sliding. We then apply the regime diagram to observed glaciers for quantitative comparisons. These include the Svalbard glaciers of both normal and surge types, Northeast Greenland Ice Stream characterized by steady-sliding, and Hudson Strait Ice Stream exhibiting cyclic surges. The quantitative validation of our model containing no free parameters suggests that the thermal switch may unify the dynamics of these diverse glaciers.

scholarly journals Essence and factor conditionality of enterprise innovative susceptibility

2020 ◽  
pp. 66-72
Author(s):  
Elena Karpenko ◽  
Darya Pavlova
Keyword(s):  
Full Range ◽  
Innovation Activity ◽  
Observation Data ◽  
Resource Base ◽  
Factors Affecting ◽  
Complex Process ◽  
Analysis And Synthesis ◽  
Innovative Capabilities ◽  
External Conditions ◽  
External Sources

The subjeсt of the researсh is the innovative susceptibility of the enterprise. The goal of the researсh is to identify the most significant factors affecting the level of innovative susceptibility of the enterprise. The researсh methods used are observation, data сolleсtion, analysis, and synthesis, сomparison, grouping, systematiс and сomplex approaсh. The researсh results. In the framework of this study, the authors analyzed the innovative activity of the enterprise as a detailed expression of its innovative susceptibility, which by its results is logically connected with the full range of end results of the enterprise functioning as a production system and is subordinated to the need to achieve a given level of such results. The domain of appliсability of the researсh results is the innovative policy of the enterprise, focused on improving its market position. Сonсlusions. The formation and implementation of the innovative susceptibility of the enterprise is a complex process, the course of which is determined by the complex effect of various factors that have both internal and external sources in relation to the enterprise. At its core, the transition of innovative susceptibility of an enterprise from its unrealized (factorial) form to a form of direct innovation activity is a natural process of transforming the formed innovative capabilities of an enterprise into concrete innovations. This process becomes real when it has the necessary resource base, sufficient internal and external conditions are created, and also when the personnel of the enterprise are genuinely motivated to take innovative actions.

Adsorption-Controlled Thermal Switch Using Nonequilibrium Molecular Dynamics Simulation

2016 ◽  
Author(s):  
Tadeh Avanessian ◽  
Gisuk Hwang
Keyword(s):  
Molecular Dynamics ◽  
Molecular Dynamics Simulation ◽  
Waste Heat ◽  
Accommodation Coefficient ◽  
Cryogenic Cooling ◽  
Dynamics Simulation ◽  
Nonequilibrium Molecular Dynamics ◽  
Thermal Switch ◽  
Thermal Switches ◽  
The Difference

A thermal switch is a system to control the heat transfer “on/off” for the desired functionalities, and this serves as a basic building block to design advanced thermal management systems in various applications including electronic packaging, waste heat recovery, cryogenic cooling, and new applications such as thermal computers. The existing thermal switches employ the macroscale mechanical-based, relatively slow transient “on/off” switch mechanisms, which may be challenging to provide solutions for micro/nanoscale applications. In this study, a fast and efficient thermal switch mechanism without having extra mechanical controlling system is demonstrated using gas-filled, heterogeneous nanogaps with asymmetric surface interactions in Knudsen regime. Argon gas atoms confined in metal-based solid surfaces are employed to predict the degree of thermal switch, S. Non-equilibrium molecular dynamics simulation is used to create the temperature gradient over the two nanogaps, and the maximum degree of thermal switch is Smax ∼ 13, which results from the difference in adsorption-controlled thermal accommodation coefficient (TAC) and pressure between the two sides of the gaps.

Development of Thermal Switches Based on Shape Memory Alloy Actuators

2018 ◽  
Author(s):  
Immanuel Voigt ◽  
Welf-Guntram Drossel ◽  
Christoph Eppler ◽  
Kenny Pagel ◽  
André Bucht
Keyword(s):  
Heat Transfer ◽  
Machine Tool ◽  
Shape Memory ◽  
Smart Materials ◽  
Heat Fluxes ◽  
Conductive Heat ◽  
Additional Energy ◽  
Thermal Switch ◽  
Thermal Switches ◽  
The Impact

In machine tool engineering, the impact of thermal issues on machine precision and efficiency has been outlined in numerous studies. One of the major challenges is the energy-efficient distribution of heat within the machine structure. In order to control occurring heat fluxes without additional energy input into the machine tool, smart materials can be used for load-dependent adjustment of heat transfer characteristics. The present study illustrates the development and examination of heat transfer switch mechanisms using shape memory alloys. Experimental and numerical results demonstrate how different types of actuators can be used to enable an energy self-sufficient thermal switch function between heat source and heat sink. Different scenarios are considered and the combination of thermal switches with highly conductive heat-transfer devices and latent heat storages is evaluated.

Time Block After Time Block

ASHA Leader ◽  
2013 ◽  
Vol 18 (8) ◽  
pp. 40-45 ◽  
Author(s):  
Judy Rudebusch ◽  
JoAnn Wiechmann
Keyword(s):  
Full Range ◽  
Time Block ◽  
School Based ◽  
Schedule Activity

To offer a full range of RTI and IEP services, school-based SLPs can schedule activity blocks rather than go student by student—here's how.

The Use of Neuroplastic Principles Affects the Swallow Motor Plan of a Patient in Severe Cognitive Decline: A Case Study

2016 ◽  
Vol 1 (15) ◽  
pp. 79-83
Author(s):  
Ed Bice ◽  
Kristine E. Galek
Keyword(s):  
Central Nervous System ◽  
Cognitive Decline ◽  
Full Range ◽  
Movement Speed ◽  
Positive Outcomes ◽  
Verbal Cues ◽  
Motor Plan ◽  
Bolus Size ◽  
The Central Nervous System

Dysphagia is common in patients with dementia. Dysphagia occurs as a result of changes in the sensory and motor function of the swallow (Easterling, 2007). It is known that the central nervous system can undergo experience-dependent plasticity, even in those individuals with dementia (Park & Bischof, 2013). The purpose of this study was to explore whether or not the use of neuroplastic principles would improve the swallow motor plan and produce positive outcomes of a patient in severe cognitive decline. The disordered swallow motor plan was manipulated by focusing on a neuroplastic principles of frequency (repetition), velocity of movement (speed of presentation), reversibility (Use it or Lose it), specificity and adaptation, intensity (bolus size), and salience (Crary & Carnaby-Mann, 2008). After five therapeutic sessions, the patient progressed from holding solids in her mouth with decreased swallow initiation to independently consuming a regular diet with full range of liquids with no oral retention and no verbal cues.

Further Validity of the Japanese Version of the Ten Item Personality Inventory (TIPI-J)

2014 ◽  
Vol 35 (4) ◽  
pp. 236-244 ◽  
Author(s):  
Atsushi Oshio ◽  
Shingo Abe ◽  
Pino Cutrone ◽  
Samuel D. Gosling
Keyword(s):  
Big Five ◽  
Content Validity ◽  
Structural Equation ◽  
English Language ◽  
Full Range ◽  
Reliability And Validity ◽  
Japanese Version ◽  
Personality Inventory ◽  
Equation Modeling ◽  
Big Five Personality

The Ten Item Personality Inventory (TIPI; Gosling, Rentfrow, & Swann, 2003 ) is a widely used very brief measure of the Big Five personality dimensions. Oshio, Abe, and Cutrone (2012) have developed a Japanese version of the TIPI (TIPI-J), which demonstrated acceptable levels of reliability and validity. Until now, all studies examining the validity of the TIPI-J have been conducted in the Japanese language; this reliance on a single language raises concerns about the instrument’s content validity because the instrument could demonstrate reliability (e.g., retest) and some forms of validity (e.g., convergent) but still not capture the full range of the dimensions as originally conceptualized in English. Therefore, to test the content validity of the Japanese TIPI with respect to the original Big Five formulation, we examine the convergence between scores on the TIPI-J and scores on the English-language Big Five Inventory (i.e., the BFI-E), an instrument specifically designed to optimize Big Five content coverage. Two-hundred and twenty-eight Japanese undergraduate students, who were all learning English, completed the two instruments. The results of correlation analyses and structural equation modeling demonstrate the theorized congruence between the TIPI-J and the BFI-E, supporting the content validity of the TIPI-J.

The influence of external conditions on sound pressure in the pistonphone at the infrasound frequency range

2020 ◽  
pp. 67-72
Author(s):  
A. V. Konkov ◽  
D. V. Golovin
Keyword(s):  
Environmental Conditions ◽  
Sound Pressure ◽  
Primary Method ◽  
Frequency Range ◽  
External Conditions ◽  
Numerical Estimations

The influence of environmental conditions on a sound pressure reproduced by the primary method in the measuring chambers of the Pistonphone in the frequency range from 1 mHz to 250 Hz is estimated. Numerical estimations of influence of environmental conditions on sound pressure in pistonphone measuring chambers are given and special requirements to system of maintenance of required external conditions are specified.

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