scholarly journals Experimental Study on Consolidation Characteristics of Compacted Loess

2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
Jinhua Li ◽  
Songwei Zhao ◽  
Xiong Wang ◽  
Jiaqi Hao ◽  
Bin Zhi ◽  
...  
Keyword(s):  
Experimental Study ◽  
Critical Time ◽  
Foundation Settlement ◽  
Time Curve ◽  
Consolidation Pressure ◽  
Consolidation Coefficient ◽  
Compaction Energy ◽  
Cumulative Deformation ◽  
Compacted Loess ◽  
Time Point

The prediction of foundation settlement is an important topic in loess filling engineering. Based on a filled foundation in Yan’an, China, this study explores the consolidation characteristics of compacted loess with different compaction energy and consolidation pressure through consolidation tests, analyzes the strain-time curve and refines the curve within 2 h, separates the primary and secondary consolidations, and obtains the critical time point between the primary and secondary consolidations. Deformation rate S t ′ and cumulative deformation St were introduced to analyze the S t ′  − St curve at the secondary consolidation stage; the secondary consolidation coefficient was employed to describe the secondary consolidation characteristics of compacted loess. According to the secondary consolidation characteristics, a prediction model of loess settlement considering different compaction energy and fill thickness was proposed, and the applicability of the model was further analyzed. The model will facilitate in guiding the design and construction of loess filling engineering.

scholarly journals Biomechanical and Histomorphometric Characterizations of Osseointegration during Mini-Screw Healing in Rabbit Tibiae*

2009 ◽  
Vol 79 (3) ◽  
pp. 558-563 ◽  
Author(s):  
Jing Wu ◽  
Yu-Xing Bai ◽  
Bang-Kang Wang
Keyword(s):  
Continuous Process ◽  
Critical Time ◽  
Healing Time ◽  
New Bone Formation ◽  
Biomechanical Stability ◽  
Maximum Torque ◽  
Rabbit Tibia ◽  
Pullout Load ◽  
Stability Measurements ◽  
Time Point

Abstract Objective: To evaluate effects of different healing times on integration of titanium mini-screws and bones under unloaded conditions. Materials and Methods: Biomechanical stability measurements and histomorphometric observations were performed in a rabbit tibia model after different healing times: 0 (immediate) and 1, 2, 4, and 8 weeks. Results: Biomechanical stability and both maximum torque and maximum pullout load increased with healing time but increased significantly only after 4 weeks. Maximum torque and maximum pullout load both significantly correlated with healing time and with each other. Similarly, histomorphometric analyses showed that new bone formation increased with healing time but increased dramatically only after 4 weeks. The data may provide guidance for determining optimal implant plans in clinical practice. Conclusion: Mini-screw healing is a continuous process, and week 4 is a critical time point in this process.

A Critical-Time-Point Approach to All-Departure-Time Lagrangian Shortest Paths

2015 ◽  
Vol 27 (10) ◽  
pp. 2591-2603 ◽  
Author(s):  
Venkata M.V. Gunturi ◽  
Shashi Shekhar ◽  
KwangSoo Yang
Keyword(s):  
Shortest Paths ◽  
Critical Time ◽  
Departure Time ◽  
Time Point

scholarly journals Experimental Study on Resistivity Characteristics of Compacted Loess

2020 ◽  
Vol 455 ◽  
pp. 012110
Author(s):  
Xiangning Li ◽  
Wankui Ni ◽  
Min Zhu ◽  
Haiman Wang
Keyword(s):  
Experimental Study ◽  
Compacted Loess

The Engineering Properties Comparative Study of Wetlands Soft Soil and Soft Soil of other Genesis

2010 ◽  
Vol 150-151 ◽  
pp. 484-492
Author(s):  
Hong Jun Liu ◽  
Wei Shan ◽  
Yan Qiu Yang ◽  
Chun Jiao Wang ◽  
Ying Guo ◽  
...  
Keyword(s):  
Comparative Study ◽  
Soft Soil ◽  
Engineering Properties ◽  
Mechanical Index ◽  
Consolidation Pressure ◽  
Shearing Strength ◽  
Consolidation Coefficient ◽  
Soil Foundation ◽  
Soft Soil Foundation ◽  
Consolidation Degree

In order to provide technical reference in soft soil foundation treatment for construction of high-grade highway in wetlands soft soil area,by collecting undisturbed soil samples in Qiqihaer-Fuyu section of Jiagedaqi-Beijing highway and using triaxial tests, direct shear test, compressed consolidation testing and other testing methods, a detailed laboratory test and study has been carried out on the soft soil engineering properties and the comparative study on physical and mechanical index, compressed consolidation properties, shearing strength and shearing strength index and so on of wetlands soft soil and other genesis soft soil has been carried out,the results showed that: wetlands soft soil is better than delta soft soil in basic physical and mechanical index; comparing shearing strength parameters of wetlands soft soil and lacustrine soft soil shows that: under smaller consolidation degree and the consolidation pressure, their cohesion decreased with the increase of consolidation degree;with the consolidation degree and the consolidation pressure become bigger, the cohesion of wetlands soft soil is higher than lacustrine soft soil, internal friction angle changed little; Comparing with marine soft soil, the primary consolidation coefficient of wetlands soft soil is bigger and the secondary consolidation coefficient is smaller, that shows the foundation of wetlands soft soil is easy to drainage and consolidation. The research results have guiding significances for treatment of wetland soft soil foundation.

Effects of critical time-point for selection of early cleaving 2-cell embryos on the pregnancy outcomes of IVF

2008 ◽  
Vol 90 ◽  
pp. S215
Author(s):  
J.-K. Joo ◽  
J.-R. Choi ◽  
K.-R. Ko ◽  
K.-S. Jung ◽  
Y.-Y. Kim ◽  
...  
Keyword(s):  
Pregnancy Outcomes ◽  
Critical Time ◽  
Selection Of ◽  
Time Point

Identification of the time-point which gives a plasma rabeprazole concentration that adequately reflects the area under the concentration-time curve

2006 ◽  
Vol 62 (10) ◽  
pp. 855-861 ◽  
Author(s):  
Takenori Niioka ◽  
Tsukasa Uno ◽  
Norio Yasui-Furukori ◽  
Mikiko Shimizu ◽  
Kazunobu Sugawara ◽  
...  
Keyword(s):  
Time Curve ◽  
Concentration Time ◽  
Time Point

Accurate Quantification of Two Key Time Points Used in the Determination of Hydroxyl Polyaluminum Species by Ferron Timed Spectrophotometry

2015 ◽  
Vol 98 (1) ◽  
pp. 225-229
Author(s):  
Jing Zhang ◽  
Xiaojing Yong ◽  
Dongyan Zhao ◽  
Qiuyi Shi
Keyword(s):  
Sulfonic Acid ◽  
Time Curve ◽  
Absorption Time ◽  
Time Points ◽  
Complete Reaction ◽  
Reaction Extent ◽  
Accurate Quantification ◽  
Time Point

Abstract The content of mononuclear Al (Ala%) changed with its determination time (ta) under different dosages of Ferron (7-iodo-8-hydroxyquinoline-5-sulfonic acid, [Ferron]), and the change of Ala% with [Ferron] at different ta was systematically investigated for the firsttime. Thus, the most appropriate ta was found with the optimal [Ferron]. Also, the judgment of the platform (flat or level portion) of the complete reaction on the absorption-time curve determined in the hydroxyl polyaluminum solution by Ferron timed spectrophotometry (Ferron assay) was first digitized. The time point (tb) of complete reaction between the medium polyaluminum (Alb)and Ferron reagent depended on the reaction extent, and time could not be used only to judge. Thus, the tb was accurately determined and reduced to half of original, which improved the experiment efficiency significantly. The Ferron assay was completely optimized.

scholarly journals Disposition of Caspofungin: Role of Distribution in Determining Pharmacokinetics in Plasma

2004 ◽  
Vol 48 (3) ◽  
pp. 815-823 ◽  
Author(s):  
Julie A. Stone ◽  
Xin Xu ◽  
Gregory A. Winchell ◽  
Paul J. Deutsch ◽  
Paul G. Pearson ◽  
...  
Keyword(s):  
Terminal Phase ◽  
Time Curve ◽  
Distribution Study ◽  
Concentration Time ◽  
Distribution Process ◽  
Tissue Distribution Study ◽  
Apparent Distribution ◽  
Plasma Profile ◽  
Time Point

ABSTRACT The disposition of caspofungin, a parenteral antifungal drug, was investigated. Following a single, 1-h, intravenous infusion of 70 mg (200 μCi) of [3H]caspofungin to healthy men, plasma, urine, and feces were collected over 27 days in study A (n = 6) and plasma was collected over 26 weeks in study B (n = 7). Supportive data were obtained from a single-dose [3H]caspofungin tissue distribution study in rats (n = 3 animals/time point). Over 27 days in humans, 75.4% of radioactivity was recovered in urine (40.7%) and feces (34.4%). A long terminal phase (t 1/2 = 14.6 days) characterized much of the plasma drug profile of radioactivity, which remained quantifiable to 22.3 weeks. Mass balance calculations indicated that radioactivity in tissues peaked at 1.5 to 2 days at ∼92% of the dose, and the rate of radioactivity excretion peaked at 6 to 7 days. Metabolism and excretion of caspofungin were very slow processes, and very little excretion or biotransformation occurred in the first 24 to 30 h postdose. Most of the area under the concentration-time curve of caspofungin was accounted for during this period, consistent with distribution-controlled clearance. The apparent distribution volume during this period indicated that this distribution process is uptake into tissue cells. Radioactivity was widely distributed in rats, with the highest concentrations in liver, kidney, lung, and spleen. Liver exhibited an extended uptake phase, peaking at 24 h with 35% of total dose in liver. The plasma profile of caspofungin is determined primarily by the rate of distribution of caspofungin from plasma into tissues.

scholarly journals Study on the consolidation properties of soft soil distributed in the North Center coastal area of Vietnam

2020 ◽  
Vol 61 (HTCS6) ◽  
pp. 116-122
Author(s):  
Son Truong Bui ◽  
Nu Thi Nguyen ◽  
Tho Duc Pham ◽  
Duong Thanh Nguyen ◽  
Keyword(s):  
Normal Stress ◽  
Treatment Time ◽  
Soft Soil ◽  
Applied Pressure ◽  
Liquid Limit ◽  
Unit Weight ◽  
Consolidation Pressure ◽  
The North ◽  
Consolidation Coefficient ◽  
Consolidation Parameters

Consolidation parameters of soft soil play an important role in calculating settlement and soft soil improvement by vertical drainage method (distance, quantity, treatment time). In this study, using oedometer tests, consolidation parameters of some soft soils in the North Central coastal region, Vietnam are clarified. The research results show that the compression index Cc has a strong relationship with the natural water content, liquid limit, dry unit weight, and void ratio of the soil. The consolidation coefficient significantly depends on the applied pressure level, at the over-consolidation stage (normal stress is less than pre-consolidation pressure), the consolidation coefficient is high. By contrast, at the normal consolidation stage (normal stress is greater than pre-consolidation pressure), the coefficient of consolidation is small. The pre-consolidation pressure of soil changes with the distribution depth.

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