scholarly journals State-of-the-Art Review of the Applicability and Challenges of Microbial-Induced Calcite Precipitation (MICP) and Enzyme-Induced Calcite Precipitation (EICP) Techniques for Geotechnical and Geoenvironmental Applications

Crystals ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 370
Author(s):  
Abdullah Almajed ◽  
Mohammed Abdul Lateef ◽  
Arif Ali Baig Moghal ◽  
Kehinde Lemboye
Keyword(s):  
Soil Stabilization ◽  
Living Organism ◽  
Treatment Method ◽  
Soil Mass ◽  
Soil Treatment ◽  
Calcite Precipitation ◽  
Advantages And Disadvantages ◽  
Emerging Trends ◽  
Hands On ◽  
Contaminant Remediation

The development of alternatives to soil stabilization through mechanical and chemical stabilization has paved the way for the development of biostabilization methods. Since its development, researchers have used different bacteria species for soil treatment. Soil treatment through bioremediation techniques has been used to understand its effect on strength parameters and contaminant remediation. Using a living organism for binding the soil grains to make the soil mass dense and durable is the basic idea of soil biotreatment. Bacteria and enzymes are commonly utilized in biostabilization, which is a common method to encourage ureolysis, leading to calcite precipitation in the soil mass. Microbial-induced calcite precipitation (MICP) and enzyme-induced calcite precipitation (EICP) techniques are emerging trends in soil stabilization. Unlike conventional methods, these techniques are environmentally friendly and sustainable. This review determines the challenges, applicability, advantages, and disadvantages of MICP and EICP in soil treatment and their role in the improvement of the geotechnical and geoenvironmental properties of soil. It further elaborates on their probable mechanism in improving the soil properties in the natural and lab environments. Moreover, it looks into the effectiveness of biostabilization as a remediation of soil contamination. This review intends to present a hands-on adoptable treatment method for in situ implementation depending on specific site conditions.

Science Fiction and Administrative Truths: The Short Story and Novella as Administrative Cases

Public Voices ◽  
2017 ◽  
Vol 2 (3) ◽  
pp. 61
Author(s):  
Nolan J. Argyle ◽  
Lee M. Allen
Keyword(s):  
Science Fiction ◽  
Public Administration ◽  
Short Story ◽  
Interesting Case ◽  
Organizational Complexity ◽  
Professional Career ◽  
Playing Field ◽  
Advantages And Disadvantages ◽  
Hands On

Pre-service and in-service MPA students share a common desire for hands-on, real world instruction related to their professional career goals, leading to a pedagogic discounting of fiction as an appropriate tool for analyzing and "solving" problems. However, several factors weigh heavily in favor of using science fiction short stories and novellas in the MPA classroom setting. These include the need for interesting case scenarios exploring various administrative issues; leveling the playing field between the two types of students by de-emphasizing the use of "contemporary" cases; access to literature that explores the future shock of increasing organizational complexity; and the desirability of Rorschach type materials that facilitate discussion of. values and administrative truths. The discussion proceeds by tracing the development of the case study technique, its advantages and disadvantages in the classroom, addressing the utility of "fiction" as an educational resource, and showing how the science fiction literature has matured to the point where it can be applied in all of the major sub-fields of public administration. Several outstanding examples are detailed, and a thorough bibliography is provided.

scholarly journals Preliminary research for identification of bacteria useful in microbially induced calcium carbonate precipitation

2018 ◽  
Vol 44 ◽  
pp. 00115
Author(s):  
Katarzyna Misiołek ◽  
Paweł Popielski ◽  
Katarzyna Affek
Keyword(s):  
Calcium Carbonate ◽  
Soil Stabilization ◽  
Carbonate Precipitation ◽  
Calcium Carbonate Precipitation ◽  
Construction Sites ◽  
Calcite Precipitation ◽  
Strength Parameters ◽  
Gram Staining ◽  
Identification Of Bacteria

MICP (Microbially Induced Calcite Precipitation) is a new biological method in soil stabilization. This cheap and eco-friendly technique improves strength parameters of the ground such as shear strength and decreases the permeability of gravelly and sandy soil. There are variety of microorganisms that can be used in calcite precipitation. The most popular method is precipitation of calcium carbonate by bacteria. The main purpose of the article is to present the results from Gram staining of bacteria isolated from construction sites, which is the first step of their identification. Gram’s method allows to find out which morphological groups of bacteria are adapted to conditions present in soil from construction sites and therefore are potentially able to produce calcite. The article describes the methodology of isolation, staining and determination of morphological types of bacteria.

scholarly journals ADVANTAGES AND DISADVANTAGES OF DIGITAL SURGERY IN DENTAL REHABILITATION. LITERATURE REVIEW WITH A DESCRIPTION OF THE CLINICAL CASE

2021 ◽  
Vol 16 (4) ◽  
pp. 13-19
Author(s):  
Aleksandr Ivashov ◽  
Kristina Dement'eva ◽  
Petros Nersesyan ◽  
Yuliya Mandra ◽  
Valery Khodko
Keyword(s):  
Clinical Case ◽  
Treatment Protocol ◽  
Operation Time ◽  
Treatment Method ◽  
Bibliographic Databases ◽  
Navigation Surgery ◽  
Advantages And Disadvantages ◽  
Implant Placement ◽  
Dental Implantation ◽  
Surgical Template

Subject. With the advent of advanced imaging technology and CAD/CAM technologies, the possibility of guided surgery has become of wide interest among implantology. The article is devoted to the use of surgical template implantation in the rehabilitation of a dental patient. It provides information about some advantages and disadvantages of the digital protocol in comparison with traditional dental implantation. The main stages of navigation surgery in a clinical case are described. Goal. To evaluate the actual clinical advantages and disadvantages of dental implant placement using a surgical template compared to the traditional treatment protocol. Methodology. The literature search was conducted in scientific search bibliographic databases such as PubMed, eLIBRARY, Medline, and Google Academy. More than 384 studies up to 2014 were found under the thematic headings "Dental implantation" and "Surgical template". During the study of these works, the sample included 56 articles and literature reviews. Conclusions. Recently, implant placement using a surgical template has become a popular treatment method among dental surgeons. The study of modern literature allowed us to formulate the main advantages and disadvantages of this method. Advantages of the method: precise positioning of implants; flap-free surgery reduces the operation time and is characterized by a favorable postoperative course; integration of restoration determinants in surgical planning, which leads to a more aesthetic, functional and predictable result of prosthetics; the possibility of pre-manufacturing a prosthesis based on the planned position of the implant; simplification of the surgical procedure for the dentist. However, this method is not without its drawbacks: the surgeon's inability to visualize anatomical structures; the risk of axis and depth deviation during implant placement; requires additional digital planning.

scholarly journals PREDICTION OF GEOMECHANICAL STATE OF STABILIZED SOIL FOUNDATION OF MINE ENGINEERING BUILDING

2019 ◽  
pp. 199-210
Author(s):  
M. V. Sokolov ◽  
S. M. Prostov ◽  
O. V. Gerasimov
Keyword(s):  
Soil Stabilization ◽  
Soft Soil ◽  
Physical And Mechanical Properties ◽  
Soil Mass ◽  
Geological Structure ◽  
Parameter Adjustment ◽  
Injection Method ◽  
Pressure Injection ◽  
Geomechanical State ◽  
Soil Foundation

Purpose: Prediction of geomechanical state of soft-soil foundation of buildings before and after compaction, reinforcement or stabilization. Calculation of parameters of pressure injec-tion while stabilizing the soft man-made soil foundation, development of recommendations for parameter adjustment of pressure injection.Methods: Numerical methods and computer mod-eling of the soil foundation using the finite element method for studying its geomechanical state of a mining building with regard to heterogeneities of the local geological structure and changes in the physical and mechanical properties of soils.Research findings: The obtained results are based on engineering and geological surveys of the soil foundation of the mining building composed of man-made bulk soils. The stress-strain state of the soil foundation is simulated. As a result of injection compaction the geomechanical state of the soil mass chang-es.Practical implications: Recommendations are given for the parameter adjustment of the injection method. It is shown that the pressure injection method is undoubtedly effective for the soil stabilization for buildings.  

Soil Stabilization Against Water Erosion via Calcite Precipitation by Plant-Derived Urease

2019 ◽  
pp. 753-762
Author(s):  
Alessia Cuccurullo ◽  
Domenico Gallipoli ◽  
Agostino Walter Bruno ◽  
Charles Augarde ◽  
Paul Hughes ◽  
...  
Keyword(s):  
Soil Stabilization ◽  
Water Erosion ◽  
Calcite Precipitation

Evaluating the Cost and Effectiveness of Customer Training Methods

1978 ◽  
Vol 22 (1) ◽  
pp. 331-331
Author(s):  
Stephen H. Ellis
Keyword(s):  
Field Studies ◽  
Training Effectiveness ◽  
Alternative Methods ◽  
Training Methods ◽  
Advantages And Disadvantages ◽  
Hands On ◽  
Different Types ◽  
Self Instruction ◽  
The Cost ◽  
Customer Training

The talk will deal with alternative methods of training customers to use new telephone services. Various measures of training effectiveness will be discussed with regard to their advantages and limitations. It will be argued that several measures—including cost—must be taken into account when evaluating training approaches. Two field studies will be described that examine several different types of training: (1) “Hands On” (demonstration) vs. “No Hands On” training; (2) Media-based vs. Lecture-based training; (3) “Live” training vs. Self-Instruction. The advantages and disadvantages of each approach will be described in terms of several measures of training effectiveness.

scholarly journals Utility of Photodynamic Therapy in Dentistry: Current Concepts

2020 ◽  
Vol 8 (2) ◽  
pp. 43
Author(s):  
Anette Stájer ◽  
Szilvia Kajári ◽  
Márió Gajdács ◽  
Aima Musah-Eroje ◽  
Zoltán Baráth
Keyword(s):  
Photodynamic Therapy ◽  
Clinical Success ◽  
Maxillofacial Surgery ◽  
Treatment Method ◽  
Treatment Modalities ◽  
Oral And Maxillofacial Surgery ◽  
Invasive Treatment ◽  
Advantages And Disadvantages ◽  
Non Invasive ◽  
Wide Range

The significant growth in scientific and technological advancements within the field of dentistry has resulted in a wide range of novel treatment modalities for dentists to use. Photodynamic therapy (PDT) is an emerging, non-invasive treatment method, involving photosensitizers, light of a specific wavelength and the generation of singlet oxygen and reactive oxygen species (ROS) to eliminate unwanted eukaryotic cells (e.g., malignancies in the oral cavity) or pathogenic microorganisms. The aim of this review article is to summarize the history, general concepts, advantages and disadvantages of PDT and to provide examples for current indications of PDT in various subspecialties of dentistry (oral and maxillofacial surgery, oral medicine, endodontics, preventive dentistry, periodontology and implantology), in addition to presenting some images from our own experiences about the clinical success with PDT.

scholarly journals Improving Shear Strength Parameters of Sandy Soil using Enzyme-Mediated Calcite Precipitation Technique

2018 ◽  
Vol 20 (2) ◽  
pp. 91 ◽  
Author(s):  
Heriansyah Putra ◽  
Hideaki Yasuhara ◽  
Naoki Kinoshita ◽  
Erizal . ◽  
Tri Sudibyo
Keyword(s):  
Shear Strength ◽  
Sandy Soil ◽  
Friction Angle ◽  
Soil Improvement ◽  
Soil Mass ◽  
Shear Strength Parameters ◽  
Calcite Precipitation ◽  
Strength Parameters ◽  
Direct Shear Tests ◽  
Potential Applications

Several methods have been established for their various potential applications as soil improvement technique, and recently the application of grouting technique using biological process have been proposed. This study discussed the applicability of enzyme-mediated calcite precipitation (EMCP) in improving the shear strength parameters of sandy soil.  In this study, soil specimens were prepared and treated with the grouting solutions composed of urea, calcium chloride, magnesium sulfate and enzyme of urease. Evolutions in the cohesion and internal friction angle of the improved soil were examined through the direct shear tests. The presence of the precipitated materials, comprising 4.1 percent of the soil mass of the treated sand, generated a cohesion of 53 kPa. However, contrary to the improvement of cohesion, the friction angle is relatively constant. It indicated that the application of the EMCP technique has no significant impact on the friction angle

scholarly journals Fly Ash as an Ingredient in the Contaminated Soil Stabilization Process

Energies ◽  
2022 ◽  
Vol 15 (2) ◽  
pp. 565
Author(s):  
Kamil Banaszkiewicz ◽  
Tadeusz Marcinkowski ◽  
Iwona Pasiecznik
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
Water Absorption ◽  
Contaminated Soil ◽  
Coal Combustion ◽  
Soil Stabilization ◽  
Soil Mass ◽  
Flame Ionization ◽  
Benzene Concentration ◽  
Average Compressive Strength

Fly ash is the main by-product of coal combustion characterized by a large specific surface area. In addition to oxides, it also contains unburned coal and trace elements. This study aimed to investigate the possibility of using fly ash from pit-coal combustion (CFA) for the treatment of benzene-contaminated soil (S). The CFA was used as a mixture with Portland cement (PC) (70% PC + 30% CFA). The soil was treated with a PC-CFA mixture in amounts of 40, 60, and 80% of soil mass. During the process, the concentration of benzene was monitored with the flame-ionization detector. Produced monoliths (S+(PC-CFA)x) were tested for compressive strength and capillary water absorption. The experiment confirmed that the PC-CFA mixture limited benzene emission. The highest reduction in benzene concentration (34–39%) was observed for samples treated with the PC-CFA mixture in an amount of 80% (S+(PC-CFA)80). The average compressive strength of monoliths S+(PC-CFA)40, S+(PC-CFA)60, and S+(PC-CFA)80 was 0.57, 4.53, and 6.79 MPa, respectively. The water absorption values were in the range of 15–22% dm.

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