On the physical model of frozen soil

AbstractIn this paper we discuss a physical model of frozen soil based on the systems approach and reflect contemporary knowledge about the constitution, structure and properties of this complicated medium. The component composition and specific spatial cryogenic coagulant-crystalline structure as well as physical subsystems of frozen soil conditioning its physical properties are considered. Examples of the use of a model for better comprehension and explanation of some electrical and mechanical property changes of sandy-clayey frozen soils are presented and discussed. The proposed model and its hierarchy is a useful tool for planning experiments and interpreting their results.

Download Full-text

A Physical Model of Molten Salt Data

Zeitschrift für Naturforschung A ◽

10.1515/zna-2008-7-813 ◽

2008 ◽

Vol 63 (7-8) ◽

pp. 462-466 ◽

Cited By ~ 2

Author(s):

Alexander Redkin ◽

Yurii Zaikov ◽

Olga Tkatcheva ◽

Anatoly Shuryghin

Keyword(s):

Physical Properties ◽

Molten Salt ◽

Molar Volume ◽

Physical Model ◽

Alkali Halides ◽

Ionic Systems ◽

Property Changes

Molten alkali halides can be regarded as model ionic systems. Physical properties of molten alkali halides and their mixtures depending on molar volume and temperature are considered. The properties under examination are divided into two groups: cation-dependent and anion-dependent ones. The character of property changes with temperature and molar volume is different for these groups.

Download Full-text

Effects of preferential flow on snowmelt partitioning and groundwater recharge in frozen soils

Hydrology and Earth System Sciences ◽

10.5194/hess-23-5017-2019 ◽

2019 ◽

Vol 23 (12) ◽

pp. 5017-5031 ◽

Cited By ~ 4

Author(s):

Aaron A. Mohammed ◽

Igor Pavlovskii ◽

Edwin E. Cey ◽

Masaki Hayashi

Keyword(s):

Soil Moisture ◽

Groundwater Recharge ◽

Preferential Flow ◽

Frozen Soil ◽

Time Lags ◽

Runoff Generation ◽

Frozen Ground ◽

Soil Matrix ◽

Frozen Soils ◽

Flow Through

Abstract. Snowmelt is a major source of groundwater recharge in cold regions. Throughout many landscapes snowmelt occurs when the ground is still frozen; thus frozen soil processes play an important role in snowmelt routing, and, by extension, the timing and magnitude of recharge. This study investigated the vadose zone dynamics governing snowmelt infiltration and groundwater recharge at three grassland sites in the Canadian Prairies over the winter and spring of 2017. The region is characterized by numerous topographic depressions where the ponding of snowmelt runoff results in focused infiltration and recharge. Water balance estimates showed infiltration was the dominant sink (35 %–85 %) of snowmelt under uplands (i.e. areas outside of depressions), even when the ground was frozen, with soil moisture responses indicating flow through the frozen layer. The refreezing of infiltrated meltwater during winter melt events enhanced runoff generation in subsequent melt events. At one site, time lags of up to 3 d between snow cover depletion on uplands and ponding in depressions demonstrated the role of a shallow subsurface transmission pathway or interflow through frozen soil in routing snowmelt from uplands to depressions. At all sites, depression-focused infiltration and recharge began before complete ground thaw and a significant portion (45 %–100 %) occurred while the ground was partially frozen. Relatively rapid infiltration rates and non-sequential soil moisture and groundwater responses, observed prior to ground thaw, indicated preferential flow through frozen soils. The preferential flow dynamics are attributed to macropore networks within the grassland soils, which allow infiltrated meltwater to bypass portions of the frozen soil matrix and facilitate both the lateral transport of meltwater between topographic positions and groundwater recharge through frozen ground. Both of these flow paths may facilitate preferential mass transport to groundwater.

Download Full-text

Mechanical property changes in drawing/extrusion of hardening viscoplastic materials with damage

International Journal of Mechanical Sciences ◽

10.1016/s0020-7403(96)00064-1 ◽

1997 ◽

Vol 39 (5) ◽

pp. 565-573 ◽

Cited By ~ 5

Author(s):

Yong-Shin Lee ◽

Seung-Yeun Hahm

Keyword(s):

Mechanical Property ◽

Property Changes

Download Full-text

Recent results on mechanical property changes obtained by light ion simulation

Journal of Nuclear Materials ◽

10.1016/0022-3115(84)90638-x ◽

1984 ◽

Vol 122 (1-3) ◽

pp. 448

Author(s):

H. Ullmaier ◽

H. Schroeder ◽

P. Jung

Keyword(s):

Mechanical Property ◽

Property Changes

Download Full-text

Study on the Water-Physical Properties of the Cement-Plaster Bonded Rock-Like Materials

Advances in Civil Engineering ◽

10.1155/2021/8863064 ◽

2021 ◽

Vol 2021 ◽

pp. 1-7

Author(s):

Yong Zhang ◽

Zhiguo Cao ◽

Xiaomeng Shi

Keyword(s):

Physical Properties ◽

Physical Model ◽

Coupling Model ◽

Model Tests ◽

Physical Parameters ◽

Test Results ◽

Physical Model Tests ◽

Fluid Coupling ◽

Softening Coefficient ◽

Solid Fluid Coupling

The cement-plaster bonded rock-like material is one of the most commonly used materials to simulate different rocks in physical model tests. However, the applicability of this material in solid-fluid coupling model tests is not clear because there are few research studies on the water-physical properties of this material and its similarity to the actual rock is uncertain. This paper presents a systemic experimental study on the water-physical properties of the cement-plaster bonded rock-like materials. The parameters of rock-like materials, including water absorption, softening coefficient, and permeability coefficient, were compared with those of actual rocks to analyse the applicability of such material. Then, the influence of proportion on the water-physical properties of this material was discussed. By multiple regression analysis of the test results, empirical equations between the water-physical parameters and proportions were proposed. The equations can be used to estimate the water-physical properties of cement-plaster bonded rock-like materials with specific proportion and thus to select suitable materials in the solid-fluid coupling physical model tests.

Download Full-text

The implementation of total quality management in Arab universities: A proposed model

International Journal of ADVANCED AND APPLIED SCIENCES ◽

10.21833/ijaas.2021.07.008 ◽

2021 ◽

Vol 8 (7) ◽

pp. 67-76

Author(s):

Abdul-Wasea Abdul-Ghani Saif Almekhlafi ◽

◽

Keyword(s):

Quality Management ◽

Total Quality Management ◽

Customer Service ◽

Systems Approach ◽

Integrated System ◽

Total Quality ◽

Academic Leaders ◽

Intellectual Content ◽

Final Sample ◽

Proposed Model

The purpose of this study is to develop a model for the implementation of total quality management in higher educational institutions, Arab universities. This model exceeds the limitations in the implemented current models in various business organizations through implementing the systems approach and process entry in the design that includes inputs, processes, outputs, and goals. This study is a survey-based methodology in which the survey is designed based on the 7 famous models of implementing the total quality with an adaption within the framework of the total quality management concept. The final sample consists of 51 academic leaders at Prince Sattam bin Abdulaziz University who hold various experiences in working with different Arab universities. The results of this study indicate that the proposed model obtained high relative importance that reached at the axis level a high degree ranged between 76.39%-80.78%, and at the overall level reached a percentage of 80.39%. This confirms the importance of the model in expressing the intellectual content of management of total quality as an integrated system of universities as open organizations to their external context. This study recommends that high leaders should believe in the importance of total quality management and encourage its application through the proposed model with its essential criteria and its sub-dimensions and spreading the culture of total quality management and customer service among workers.

Download Full-text

Swelling and Mechanical Property Changes in Russian and American Austenitic Steels in EBR-II and BN350

Nuclear Technology ◽

10.13182/nt03-a3451 ◽

2003 ◽

Vol 144 (3) ◽

pp. 369-378 ◽

Cited By ~ 3

Author(s):

Fatma Yilmaz ◽

Yassin A. Hassan ◽

Douglas L. Porter ◽

Oleg Romanenko

Keyword(s):

Mechanical Property ◽

Austenitic Steels ◽

Property Changes

Download Full-text

4,5-Seco-4,6-cyclosteroids. I. Structure and properties of the diol from reductive rearrangement of 6β-Bromo-4β,5-epoxy-5β-cholestan-3β-ol

Australian Journal of Chemistry ◽

10.1071/ch9690607 ◽

1969 ◽

Vol 22 (3) ◽

pp. 607

Author(s):

DJ Collins ◽

JJ Hobbs ◽

RJ Rawson

Keyword(s):

Physical Properties ◽

Transformation Products ◽

High Yield ◽

Lithium Aluminium Hydride ◽

Structure And Properties ◽

Lithium Aluminium

Treatment of 6β-bromo-4β,5-epoxy-5β-cholestan-3β-ol (IV) with lithium aluminium hydride in tetrahydrofuran at reflux for 16 hr gave a high yield of a new diol, C27H48O2, formulated as 4,5-seco-4,6-cyolo-6β- cholestane-3β,5α-diol (VIIa). This assignment follows from mechanistic considerations, and the chemical and physical properties of the dial and its transformation products. �� Stepwise removal of the oxygen functions gave the new hydrocarbon 4,5-seco-4,6-cyclo-6β-cholestane (XIXg).

Download Full-text

Information-As-System in Information Systems

Emerging Systems Approaches in Information Technologies ◽

10.4018/978-1-60566-976-2.ch007 ◽

2010 ◽

pp. 99-118

Author(s):

Tuan M. Nguyen ◽

Huy V. Vo

Keyword(s):

Information Systems ◽

Structure Function ◽

Conceptual Model ◽

Systems Thinking ◽

Systems Approach ◽

Complex Nature ◽

Holistic Thinking ◽

Proposed Model ◽

Nature Of Information

This article investigates the complex nature of information in information systems (IS). Based on the systems thinking framework, this study argues that information in IS is a system in its own right. A conceptual model of information-as-system is built on the systems thinking perspective adopted from Gharajedaghi’s holistic thinking rooted from Ackoff systems approach, which is developed through Peirce’s semiotics with the validity support of Metcalfe and Powell’s perspective of information perception, Mingers and Brocklesby’s schema of situational actions, Toulmin’s theory of argumentation and Ulrich’s theory of systems boundary. The proposed model of information-as-systems is described in terms of triads–on the structure, function, and process, all interdependent–in a context of information-as-system in IS.

Download Full-text