Behavior of clayey soils on drying–wetting paths

1993 ◽  
Vol 30 (2) ◽  
pp. 287-296 ◽  
Author(s):  
Jean-Marie Fleureau ◽  
Siba Kheirbek-Saoud ◽  
Ria Soemitro ◽  
Said Taibi
Keyword(s):  
Experimental Research ◽  
Negative Pressure ◽  
Unsaturated Soils ◽  
Liquid Limit ◽  
The Other ◽  
Clayey Soils ◽  
Initial State ◽  
Stress Increase ◽  
Negative Pressures ◽  
Clayey Materials

Experimental research was carried out on 11 different clayey materials to determine the main characteristics of the drying and wetting paths and the influence of initial state and other factors. Normally consolidated paths are shown to have a large saturated domain, in which a negative pressure is equivalent to an isotropic stress increase; such paths can be derived from correlations with the liquid limit. On the other hand, the behavior of overconsolidated or dried samples is largely dependent on the range of stresses and negative pressures. Key words : suction, unsaturated soils, drying, wetting, correlations, models.

scholarly journals Unifying framework for modeling swelling soil behaviour

2016 ◽  
Vol 53 (9) ◽  
pp. 1495-1509 ◽  
Author(s):  
B.F. Lim ◽  
G.A. Siemens
Keyword(s):  
Unsaturated Soils ◽  
Expansive Soils ◽  
Liquid Limit ◽  
Initial State ◽  
Rigid Boundary ◽  
Destructive Effect ◽  
Equilibrium Limit ◽  
Swelling Soils ◽  
Swell Potential ◽  
Soil Behaviour

The destructive effect of expansive soils on infrastructure is one of the classical issues associated with unsaturated soils. Given the continuing challenges associated with swelling soils there is still a need for a practical analysis method. The swelling equilibrium limit (SEL) provides a concept for modeling expansive soil behaviour. The SEL is an upper bound swelling limit, which depends on the soil’s initial state and the boundary conditions upon wetting. The SEL is obtained experimentally from swelling tests performed by applying a range of swelling scenarios from rigid boundary condition to free swelling without confinement. In this paper, improvements to the triaxial swelling apparatus are reported, SELs for two new swelling soils are characterized, and a framework for SEL prediction is developed. The SEL framework is developed to relate SEL parameters to index properties as well as the soil’s initial volume. SEL parameters are correlated to liquid limit, plasticity index, free swell potential, and specific volume. The relationships are used to estimate the SEL for Regina clay, which is shown to agree with experimental data.

scholarly journals A Discontinuity of the Energy of Quantum Walk in Impurities

Symmetry ◽  
2021 ◽  
Vol 13 (7) ◽  
pp. 1134
Author(s):  
Kenta Higuchi ◽  
Takashi Komatsu ◽  
Norio Konno ◽  
Hisashi Morioka ◽  
Etsuo Segawa
Keyword(s):  
Unit Circle ◽  
Stationary State ◽  
Discrete Time ◽  
Quantum Walk ◽  
Time Limit ◽  
The Other ◽  
Unitary Matrix ◽  
Initial State ◽  
Time Quantum ◽  
Long Time

We consider the discrete-time quantum walk whose local dynamics is denoted by a common unitary matrix C at the perturbed region {0,1,⋯,M−1} and free at the other positions. We obtain the stationary state with a bounded initial state. The initial state is set so that the perturbed region receives the inflow ωn at time n(|ω|=1). From this expression, we compute the scattering on the surface of −1 and M and also compute the quantity how quantum walker accumulates in the perturbed region; namely, the energy of the quantum walk, in the long time limit. The frequency of the initial state of the influence to the energy is symmetric on the unit circle in the complex plain. We find a discontinuity of the energy with respect to the frequency of the inflow.

Experiment

2016 ◽  
Author(s):  
Uljana Feest ◽  
Friedrich Steinle
Keyword(s):  
Social Sciences ◽  
Causal Inference ◽  
Experimental Research ◽  
The Other ◽  
Dynamic Processes ◽  
Philosophical Work ◽  
Entity Realism ◽  
Experimental Systems ◽  
The World

The authors provide an overview of philosophical discussions about the roles of experiment in science. First, they cover two approaches that took shape under the heading of “new experimentalism” in the 1980s and 1990s. One approach was primarily concerned with questions about entity realism, robustness, and epistemological strategies. The other has focused on exploratory experiments and the dynamic processes of experimental research as such, highlighting its iterative nature and drawing out the ways in which such research is grounded in experimental systems, concepts and operational definitions. Second, the authors look at more recent philosophical work on the epistemology of causal inference, in particular highlighting discussions in the philosophy of the behavioral and social sciences, concerning the extrapolation from laboratory contexts to the world.

scholarly journals Measurement for accentedness, pause frequency/duration and nuclear stress placement in the EFL classroom

2017 ◽  
Vol 70 (3) ◽  
pp. 185-200
Author(s):  
Pedro Luis Luchini
Keyword(s):  
Multivariate Analysis ◽  
Experimental Research ◽  
Native Speaker ◽  
The Other ◽  
Speaking Test ◽  
Phonological Form ◽  
Group B ◽  
English Native Speaker ◽  
Teacher Centered ◽  
Stress Placement

This study reports on an experimental research carried out with 50 Spanish-L1 trainees, divided into 2 groups: A & B. Both groups were presented with a traditional-teacher centered approach based on controlled exercises (repetition, imitation), but group B added a communicative component in which students completed a battery of sequenced tasks with a focus on phonological form. Both groups recorded a speaking test before & after instruction which was used to measure and compare degrees of accentedness, frequency & duration of pauses and nuclear stress placement. Ten English-native-speaker-raters judged the recordings to determine the speakers’ degree of perceived accentedness. Two specialists, using inter-marker reliability, segmented the transcriptions of recordings and identified nuclear stress placement. Another two specialists identified empty pauses. Multivariate analysis was used to measure results. Overall, group B (learners exposed to the communicative component) obtained better results in all 3 parameters than the other group. Finally, some pedagogical implications for the teaching of L2 pronunciation in ELT contexts will be discussed. 

scholarly journals Designing Big Story Book Project (BSBP) in Teaching Reading Comprehension

2017 ◽  
Vol 4 (1) ◽  
pp. 61-67
Author(s):  
Aswin Abbas
Keyword(s):  
Reading Comprehension ◽  
Experimental Research ◽  
Learning Process ◽  
Teaching And Learning ◽  
Reading Test ◽  
The Other ◽  
Teaching Reading ◽  
Significant Difference ◽  
Post Test ◽  
Test Treatment

This research aimed find out the effectiveness of using big story book project (BSBP) in teaching reading comprehension and to know the advantages and the disadvantages of using BSBP in teaching reading comprehension. The researcher applied pre-experimental research design and consists of pre-test, treatment and post-test in order to find whether the big story book project (BSBP) effective in teaching reading comprehension. The instruments used in this research were reading test and questionnaire. The result from this research shows that using big story book project (BSBP) in teaching reading comprehension is effective. It is proved by the result that there is significant difference between the result of the students’ mean score in the pre-test and the post-test. In the pre-test, the students’ mean score is (43.79) and in the post-test is (80.37). Furthermore, it is proved by the probability value is smaller than α (0.00 < 0.05). On the other word, BSBP has advantages to the students if applied in teaching and learning process, especially in reading subject.

The Sucrose-Natural Gypsum Makes the Compound Retarder to the Cement and the Concretes Performance Influence Experimental Study

2011 ◽  
Vol 335-336 ◽  
pp. 1219-1222
Author(s):  
Ru Qin Wang
Keyword(s):  
Experimental Study ◽  
Physical Properties ◽  
Experimental Research ◽  
Mixing Time ◽  
The Other ◽  
Positive Correlation ◽  
Other Hand ◽  
Cement And Concrete

By the experimental research to the effect sucrose-natural gypsum as composite retarder on the performance of cement and concrete. This paper analyzes and summarizes the fact that the influence of this kind of composite retarder is more obvious than the slow setting effect of a single sugar or plaster. And the retardation of cement and concrete the mixing time is basically the amount of sugar a positive correlation. And on the other hand, it will not influence other physical properties.

Effects of negative pressures on epithelial tight junctions and migration in wound healing

2010 ◽  
Vol 299 (2) ◽  
pp. C528-C534 ◽  
Author(s):  
Chih-Chin Hsu ◽  
Wen-Chung Tsai ◽  
Carl Pai-Chu Chen ◽  
Yun-Mei Lu ◽  
Jong-Shyan Wang
Keyword(s):  
Wound Healing ◽  
Cell Migration ◽  
Negative Pressure ◽  
Ambient Pressure ◽  
Healing Process ◽  
Cell Junction ◽  
Hacat Cells ◽  
Epithelial Migration ◽  
Negative Pressures ◽  
Junction Proteins

Negative-pressure wound therapy has recently gained popularity in chronic wound care. This study attempted to explore effects of different negative pressures on epithelial migration in the wound-healing process. The electric cell-substrate impedance sensing (ECIS) technique was used to create a 5 × 10−4 cm2 wound in the Madin-Darby canine kidney (MDCK) and human keratinocyte (HaCaT) cells. The wounded cells were cultured in a negative pressure incubator at ambient pressure (AP) and negative pressures of 75 mmHg (NP75), 125 mmHg (NP125), and 175 mmHg (NP175). The effective time (ET), complete wound healing time ( Tmax), healing rate ( Rheal), cell diameter, and wound area over time at different pressures were evaluated. Traditional wound-healing assays were prepared for fluorescent staining of cells viability, cell junction proteins, including ZO-1 and E-cadherin, and actins. Amount of cell junction proteins at AP and NP125 was also quantified. In MDCK cells, the ET (1.25 ± 0.27 h), Tmax (1.76 ± 0.32 h), and Rheal (2.94 ± 0.62 × 10−4 cm2/h) at NP125 were significantly ( P < 0.01) different from those at three other pressure conditions. In HaCaT cells, the Tmax (7.34 ± 0.29 h) and Rheal (6.82 ± 0.26 × 10−5 cm2/h) at NP125 were significantly ( P < 0.01) different from those at NP75. Prominent cell migration features were identified in cells at the specific negative pressure. Cell migration activities at different pressures can be documented with the real-time wound-healing measurement system. Negative pressure of 125 mmHg can help disassemble the cell junction to enhance epithelial migration and subsequently result in quick wound closure.

scholarly journals Study of primary creep behavior of clayey soils in landslide area : suction effect

2018 ◽  
Vol 149 ◽  
pp. 02027
Author(s):  
Dahhaoui Hachimi ◽  
Belayachi Naima ◽  
Zadjaoui Abdeldjalil
Keyword(s):  
Creep Behavior ◽  
Unsaturated Soils ◽  
Primary Creep ◽  
Creep Model ◽  
Clayey Soils ◽  
Landslide Area ◽  
Deviator Stress ◽  
Landslide Process ◽  
The University

Creep behavior of clayey soils plays an extremely important role in the landslide process. The soils that make up these sliding zones are often in unsaturated state. This point indicates the need to take into account the suction effect as hydric parameter on the long-term deformation of clayey soils. In this paper, a primary creep model named Modified Time Hardening (MTH) for unsaturated soils with different matric suction has been built. Based on the literature tests results[1][2], parameters C1 and C2 of the model have relations with suction and deviator stress level respectively. The primary creep strainwill be able to demonstrate unsaturated effect of the soils. comparison between the calculated results and the literature tests results shows a good coherence. The work underway at the university of Orleans will show later the relevance of model used in the present work.

scholarly journals Effect of Spheroidization Annealing on Pearlite Banding

2019 ◽  
Vol 949 ◽  
pp. 40-47 ◽  
Author(s):  
Sergey Guk ◽  
Eva Augenstein ◽  
Maksim Zapara ◽  
Rudolf Kawalla ◽  
Ulrich Prahl
Keyword(s):  
Empirical Model ◽  
Initial Conditions ◽  
The Other ◽  
Experimental Investigations ◽  
Initial State ◽  
Ferritic Matrix ◽  
Other Hand ◽  
Initial States ◽  
Hot Rolled

The present paper deals with the influence of the duration of isothermal spheroidization annealing on the evolution of pearlite bands in various initial states. In this study, two initial conditions of the steel 16MnCrS5 are considered: a) industrially hot-rolled pearlite structures in their ferritic matrix and b) a specifically adjusted microstructure in the lab condition. Based on the experimental investigations and quantitative microstructural analyses, an empirical model for the prediction of pearlite banding within a broad range of annealing durations could be derived. Both, experiment and model, agree that pronounced pearlite bands in the initial state almost disappear after 25 h of spheroidization annealing. On the other hand, a marginal degree of pearlite banding in the initial state increases slightly during annealing. This fact could be explained by inhomogeneous cementite formation inside and outside the primary segregation regions of manganese.

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