scholarly journals The Organization of Soil Fragments

2021 ◽  
pp. 19-41
Author(s):  
Eric P. Verrecchia ◽  
Luca Trombino
Keyword(s):  
Spatial Arrangement ◽  
Crystalline Rock ◽  
Soil Micromorphology ◽  
View Point ◽  
Soil Fabric ◽  
Long Time ◽  
Or Organization ◽  
Solid Liquid ◽  
Soil Constituents

AbstractKubiëna (1938) was the first to introduce the concept of fabric in soil micromorphology, so this term has been used in soil micromorphology for a long time. The term “fabric” was initially applied to rocks by geologists and petrologists. This type of fabric is defined as the “factor of the texture of a crystalline rock which depends on the relative sizes, the shapes, and the arrangement of the component crystals” (Matthews and Boyer 1976). This definition has been adapted for soil micromorphology and its latest definition has been given by Bullock et al. (1985) as: “soil fabric deals with the total organization of a soil, expressed by the spatial arrangement of the soil constituents (solid, liquid, and gaseous), their shape, size, and frequency, considered from a configurational, functional and genetic view-point”. In conclusion, the soil micromorphologist should consider the fabric as an arrangement and∕or organization of soil constituents.

scholarly journals Clustering-Based Component Fraction Estimation in Solid–Liquid Two-Phase Flow in Dredging Engineering

Sensors ◽  
2020 ◽  
Vol 20 (19) ◽  
pp. 5697
Author(s):  
Chang Sun ◽  
Shihong Yue ◽  
Qi Li ◽  
Huaxiang Wang
Keyword(s):  
Clustering Algorithm ◽  
Two Phase Flow ◽  
Low Cost ◽  
Fast Response ◽  
New Method ◽  
Phase Flow ◽  
Reference Distribution ◽  
Two Phase ◽  
Long Time ◽  
Solid Liquid

Component fraction (CF) is one of the most important parameters in multiple-phase flow. Due to the complexity of the solid–liquid two-phase flow, the CF estimation remains unsolved both in scientific research and industrial application for a long time. Electrical resistance tomography (ERT) is an advanced type of conductivity detection technique due to its low-cost, fast-response, non-invasive, and non-radiation characteristics. However, when the existing ERT method is used to measure the CF value in solid–liquid two-phase flow in dredging engineering, there are at least three problems: (1) the dependence of reference distribution whose CF value is zero; (2) the size of the detected objects may be too small to be found by ERT; and (3) there is no efficient way to estimate the effect of artifacts in ERT. In this paper, we proposed a method based on the clustering technique, where a fast-fuzzy clustering algorithm is used to partition the ERT image to three clusters that respond to liquid, solid phases, and their mixtures and artifacts, respectively. The clustering algorithm does not need any reference distribution in the CF estimation. In the case of small solid objects or artifacts, the CF value remains effectively computed by prior information. To validate the new method, a group of typical CF estimations in dredging engineering were implemented. Results show that the new method can effectively overcome the limitations of the existing method, and can provide a practical and more accurate way for CF estimation.

Introduction

2019 ◽  
pp. 1-22
Author(s):  
Rachel Kahn Best
Keyword(s):  
Public Policy ◽  
Social Movements ◽  
Interest Groups ◽  
Agenda Setting ◽  
Social Problems ◽  
Contentious Politics ◽  
Long Time ◽  
Time Periods ◽  
Time Changes ◽  
Or Organization

For more than a century, disease campaigns have been the causes Americans ask their neighbors to donate to and the issues that inspire them to march and volunteer. Studies of social movements, interest groups, agenda setting, and social problems tend to focus on contentious politics and study one movement or organization at a time. But these approaches cannot reveal why disease campaigns are the battles Americans can agree to fight, why some diseases attract more attention than others, and how fighting one disease at a time changes charity and public policy. Understanding the causes and effects of disease campaigns, requires studying consensus politics and collecting data on fields of organizations over long time periods.

Plants in Antarctica: Current and Future Phytoremediation Potential

2014 ◽  
Vol 69 (1) ◽  
Author(s):  
Fazilah Abd Manan ◽  
Zaharah Ibrahim ◽  
Shafinaz Shahir
Keyword(s):  
Environmental Parameters ◽  
Tropical Region ◽  
Antarctic Region ◽  
Pristine Area ◽  
Long Time ◽  
Solid Liquid ◽  
Physical And Chemical ◽  
The Antarctic ◽  
Remediation Process ◽  
Harsh Condition

As an extremely cold, dry and windy part of the world, Antarctica is a unique continent that can only be inhabit by limited number of organisms. For a long time, Antarctica was a pristine area. But nowadays, it has been invaded with many kinds of pollutants derived from human activities such as solid, liquid and metal wastes. To prevent further deterioration in Antarctic environment, remediation process is strongly needed. Phytoremediation is an environmentally clean technique to remove pollutants using plants. This is an alternative to the current physical and chemical remediation method. The success of phytoremediation technique is influenced by plant species and various environmental parameters. Unlike in the temperate and tropical region, an extremely low temperature in Antarctica does not permit the growth of many types of vegetations. Thus, phytoremediation process is scarce. Despite this limitation, there are growing interests among scientists to investigate the potential of phytoremediation to occur in tremendously harsh condition. This paper reviews current pollution problems in the Antarctic region and the possibility of phytoremediation technique to be implemented in this continent.  

scholarly journals Electrical Tomography: A Review of Configurations, and Application to Fibre Flow Suspensions Characterisation

2020 ◽  
Vol 10 (7) ◽  
pp. 2355 ◽  
Author(s):  
Pedro Faia ◽  
Rui Silva ◽  
Maria G. Rasteiro ◽  
Fernando Garcia
Keyword(s):  
Flow Characteristics ◽  
Suspension Flow ◽  
Electrical Tomography ◽  
Suspension Flows ◽  
Flow Monitoring ◽  
Non Invasive ◽  
Long Time ◽  
Invasive Techniques ◽  
Solid Liquid ◽  
Industrial Relevance

Understanding the behaviour of suspension flows continues to be a subject of great interest considering its industrial relevance, regardless of the long time and effort dedicated to it by the scientific and industrial communities. Information about several flow characteristics, such as flow regimen, relative velocity between phases, and spatial distribution of the phases, are essential for the development of exact models for description of processes involving pulp suspension. Among the diverse non-invasive techniques for flow characterisation that have been reported in the literature for obtaining experimental data about suspension flow in different processes, Electrical Tomography is one of the most interesting, since it presents perhaps the best compromise among cost, portability, and, above all, safety of handling (indeed there is no need to use radiation, which requires special care when using it). In this paper, a brief review and comparison between existing technologies for pulp suspension flow monitoring will be presented, together with their strengths and weaknesses. Emphasis is given to Electrical Tomography, because it offers the above-mentioned compromise and thus was the strategy adopted by the authors to characterise different flow processes (solid–liquid, liquid–liquid, fibres, etc.). The produced portable EIT system is described, and examples of results of its use for pulp suspension flow characterisation are reported and discussed.

Solidification and Epitaxial Re-Growth in Surface Nanostructuring With Laser-Assisted Scanning Tunneling Microscope

2005 ◽  
Author(s):  
Xinwei Wang ◽  
Yongfeng Lu
Keyword(s):  
Thermal Strain ◽  
Interface Velocity ◽  
Liquid Interface ◽  
Dynamics Simulation ◽  
Scanning Tunneling ◽  
Shear Stresses ◽  
Surface Nanostructuring ◽  
Long Time ◽  
Solid Liquid Interface ◽  
Solid Liquid

In this work, parallel molecular dynamics simulation is conducted to study the long-time (up to 2 ns) behavior of argon crystal in surface-nanostructuring with laser-assisted STM. A large system consisting of more than one hundred million atoms is explored. The study is focused on the solidification procedure after laser irradiation, which is driven by heat conduction in the material. Epitaxial re-growth is observed in the solidification. Atomic dislocation due to thermal strain-induced structural damages is observed as well in the epitaxial re-growth. During solidification, the liquid is featured with decaying normal compressive stresses and negligible shear stresses. Two functions are designed to capture the structure and distinguish the solid and liquid regions. These functions work well in terms of reflecting the crystallinity of the material and identifying the atomic dislocations. The study of the movement of the solid-liquid interface reveals an accelerating velocity in the order of 3~5 m/s. The spatial distribution of the solid-liquid interface velocity indicates a non-uniform epitaxial re-growth in space. The bottom of the liquid solidifies slower than that at the edge.

Heat Conduction With Melting or Freezing in a Corner

1971 ◽  
Vol 93 (1) ◽  
pp. 101-109 ◽  
Author(s):  
Kenneth A. Rathjen ◽  
Latif M. Jiji
Keyword(s):  
Temperature Fields ◽  
Two Dimensional ◽  
Uniform Temperature ◽  
Constant Wall Temperature ◽  
Interface Position ◽  
Long Time ◽  
Quarter Space ◽  
Finite Difference Solution ◽  
Solid Liquid Interface ◽  
Solid Liquid

This paper presents an analytical solution to the two-dimensional free boundary problem of solidification of a liquid, initially at a uniform temperature and filling the quarter-space x, y > 0, subject to a constant wall temperature. The problem is the two-dimensional analog of Neumann’s freezing problem. The solution is characterized by similarity in the variables x/t1/2, y/t1/2 and is obtained by treating the heat of solidification as a moving heat source. A nonlinear, singular, integro-differential equation for the solid-liquid interface is thereby derived and used to establish superhyperbolas to approximate the interface position. Results are presented for a range of the two dimensionless parameters of the problem. The accuracy of the superhyperbolic representation of the interface position is determined by comparison with a finite-difference solution. Equations are given for the calculation of the temperature fields in the solid and liquid regions that are valid for all time (i.e., they are not necessarily short- or long-time solutions).

scholarly journals Implementasi Algoritme Profile Matching Untuk Perekrutan Karyawan

2019 ◽  
Vol 3 (2) ◽  
pp. 190-195
Author(s):  
Mujito Mujito ◽  
Basuki Hari Prasetyo ◽  
Nasrul Sani
Keyword(s):  
Human Error ◽  
Selection Process ◽  
Team Work ◽  
Support Network ◽  
Management Decision ◽  
It Infrastructure ◽  
Profile Matching ◽  
Decision Supporting ◽  
Long Time ◽  
Or Organization

IT infrastructure at PT. Citra Multi Service is a very important part in the company where this is all part of the Foundation or framework that supports a system or organization to maintenance. The prospective employee selection process done by checking and selection is manually done by checking one by one the documentary was sent by the applicant, so make appraisers hassles and inefficient and require quite a long time, and the occurrence of human error as well as an assessment of subjective, sometimes the end result is not the best prospective employees. In this study using two aspects and in the aspect there are a few criteria. The basic Technique consists of aspect criteria Desktop Support, Network Engineer, Server Engineer, Security Engineer and Data Center Engineer. On the aspect of Personality consists of Dexterity, communication, discipline, Team Work and Responsibility. Method or Algorithm used is a Matching Profile. The results of this research is an application that produces the decision supporting systems output a rank of each prospective employees, so the management decision makers can see the ability of each candidate employees based on the rank.

Cryomilling and Characterization of Metal/Ceramic Powders

2012 ◽  
Vol 512-515 ◽  
pp. 127-131 ◽  
Author(s):  
Qing Hou ◽  
Zhi Cheng Shi ◽  
Run Hua Fan ◽  
Li Cheng Ju
Keyword(s):  
Liquid Nitrogen Temperature ◽  
Mechanochemical Reaction ◽  
Solid Reaction ◽  
Scanning Calorimetry ◽  
Model Free ◽  
Particle Size Analyzer ◽  
Long Time ◽  
Solid Liquid ◽  
Kinetics Of

Al/Fe2O3 thermite powders were prepared by cryomilling at liquid nitrogen temperature. The cryogenic temperature will restrain the mechanochemical reaction between alumina and iron oxide, leading to high reactivitive nanoscale powders. The size distribution of the powders was analyzed using laser particle size analyzer, and cryomilling was proved to be an effective method to prepare ultrafine powders. The differential scanning calorimetry (DSC) analysis indicated that the cryomilled powders get more fully-reacted, a larger proportion of solid-solid reaction and more heat release in the solid-liquid reaction, comparing with the powders milled at room temperaure. Furthermore, the reaction kinetics of Al-Fe2O3 system is analyzed by a model-free Starink method. The activation energy for solid-solid reaction of 2Al-Fe2O3 thermite mixture cryomilled for 40 min is determined as 250 kJ/mol. The alternating gradient magnetometer (AGM) analysis shows that long time milling evoked the thermit reaction between Al and Fe2O3, leading to the increase in saturation magnetization (Ms) and remanent magnetization (Mr).

scholarly journals Sustainability: Obtaining Natural Dyes from Waste Matrices Using the Prickly Pear Peels of Opuntia ficus-indica (L.) Miller

Agronomy ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 528 ◽  
Author(s):  
Pierpaolo Scarano ◽  
Daniele Naviglio ◽  
Antonello Prigioniero ◽  
Maria Tartaglia ◽  
Alessia Postiglione ◽  
...  
Keyword(s):  
Liquid Extraction ◽  
Lemon Juice ◽  
Rural Populations ◽  
Opuntia Ficus Indica ◽  
Long Time ◽  
Hplc Profile ◽  
Solid Liquid Extraction ◽  
The Stability ◽  
Solid Liquid ◽  
Temperature Time

In this work, the effect of dyes extracted through the Naviglio method (an eco-innovative solid-liquid extraction technique) was tested, which proved interesting for such an extraction. The dyes extracted from Opuntia ficus-indica (L.) Miller waste were treated to maximize the extraction of the coloring molecules. The extraction method was compared with conventional methods under the same conditions. The results showed that the extracts obtained with the different techniques, in the same extraction conditions (solvent, pH, temperature, time), were richer in the pigments for the extract obtained with the Naviglio method. The stability of the dyes was tested before the staining. A plant-based fiber, cotton, as well as an animal-based fiber, wool, were chosen for the staining tests. For the two types of fiber, two etching methods were used: one with rock alum, a method widely used to fix a color and one with lemon juice, a method used for a long time by rural populations who practiced the coloring of hides and tissues. In addition, the qualitative content of the pigments was also verified with an HPLC profile of the Opuntia ficus-indica (L.) Miller extracts. Ultimately, the results suggest that the Opuntia ficus-indica (L.) Miller fruit can be of great interest as a natural source of dyes and be used for tinctures.

KEGIATAN CITATION (INDIVIDU) About Global Fluctuations Affect The Indonesian Economy In Fishery Sector Companies

2021 ◽  
Author(s):  
Tiffany Cuanda
Keyword(s):  
Economic Conditions ◽  
Issues Management ◽  
Investment Climate ◽  
Climate Conditions ◽  
Long Time ◽  
Or Organization ◽  
Global Fluctuations ◽  
A Company ◽  
Financial Issues ◽  
The Way

Global developments affect the fisheries sector business in Indonesia. Based on the performance of export and import from 2013-2019. All involvement from financial issues, management, investment, climate conditions that exist in Indonesia. Also transactions in companies in the fish tradeTransformation of the fisheries business is a risk in seeing changes in the environment, to the way a company or organization develops its business so that it can last a long time or vice versa. In fisheries business we also innovate with the budget an organization or company has by looking at economic conditions as well. Organizations also distribute and do marketing to everyone. Which is the interaction between workers and customers

Sign in / Sign up

Export Citation Format

Share Document