Stimulated resonance between electrical and shear fields by a colloid system

Abstract Implementation of demonstration method in the teaching of chemistry is assigned as the right strategy to improve students’ achievement as it is proved that the method can bring an abstract concept to reality in the class. The study is conducted to vocational high school students in SMKN1 Pargetteng getteng Sengkut Pakfak Barat at accademic year 2013. The teaching has been carried out three cycles on the teaching of chemistry topic of colloid system. In the study, the class is divided into two class, experiment class and control class. The demontration method is used to teach students in experimental class while the teaching in control class is conducted with lecture method. Both are evaluated by using multiple choise tests before and after the teaching procedures, and the ability of students to answer the problems are assigned as students’ achievements. The results showed that demonstration method improved students’ achievement in chemistry. The students in experimental class who are taughed with demonstration method (M=19.08±0.74) have higher achievements compare with control class (M=12.91±2.52), and both are significantly different (tcalculation 22.85 > ttable 1.66). The effectivity of demostration method in experimental class (97%) is found higer compare to conventional method in control class (91%).

Download Full-text

Results of researches of technological liquids based on organomineral colloid system

Neftyanoe khozyaystvo - Oil Industry ◽

10.24887/0028-2448-2020-4-30-33 ◽

2020 ◽

Vol 4 ◽

pp. 30-33

Author(s):

R.A. Gasumov ◽

◽

Yu.S. Minchenko ◽

Keyword(s):

Colloid System

Download Full-text

The Forming of Model Colloid System

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.971-973.266 ◽

2014 ◽

Vol 971-973 ◽

pp. 266-269 ◽

Cited By ~ 5

Author(s):

Denis A. Voyno ◽

Ksenia I. Machekhina ◽

Ludmila N. Shiyan

Keyword(s):

Water Treatment ◽

Zeta Potential ◽

Electrostatic Interaction ◽

Organic Substance ◽

Test System ◽

Molar Ratio ◽

Organic Substances ◽

Mechanism Of Formation ◽

Iron Silicon ◽

Colloid System

The paper reports on the creation of a model colloid test system which is similar to groundwater and it can be used as a test system in the water treatment. It is found that at the molar ratio iron/silicon/organic substance is equal to1/7/2 and two orders such as organic substances-Si-Fe and Si-organic substances-Fe, stable colloid system is formed. The mechanism of formation of iron colloid system is described by three steps. The first is the formation of the organosilicon complexes. The second is oxidation of the iron and forming of Fe (OH)3. The last is forming a sol at zeta potential is - 35 mV with electrostatic interaction.

Download Full-text

Plates in Unilateral Contact With Simple Supports: Pressure Loading

Journal of Applied Mechanics ◽

10.1115/1.3171701 ◽

1986 ◽

Vol 53 (1) ◽

pp. 141-145 ◽

Cited By ~ 3

Author(s):

N. J. Salamon ◽

T. P. Pawlak ◽

F. F. Mahmoud

Keyword(s):

Support System ◽

Unilateral Contact ◽

Response Mode ◽

Pressure Loading ◽

Analytical Work ◽

Simple Supports ◽

Square Plate ◽

Lift Off ◽

Good Agreement ◽

Shear Fields

The response of a square plate, simply and unilaterally supported, to pressure loading is numerically treated. The support system consists of discrete elastic springs whose stiffnesses range from near-rigid to compliant character. It is found that, except for rather low support stiffnesses, the plate will lift off the foundation. After demonstrating good agreement with a recent analytical work, the deflections and shear fields are provided. The response mode changes dramatically as the supports approach rigidity.

Download Full-text