bulk of the population is concentrated in just a few areas: along the coasts, in the Ebro and Guadalquivir valleys, and around Madrid. Far fewer people live in the rest of the plateau that covers most of the country
b. A characteristics of nation
Spanish are romantic and they tend to get along with people well and kind. Otherwise, they have much self-respect. Moreover, due to the fact that th
bulk solution, the target molecules, ions, etc. Interactions coming from electrostatic, hydration, steric and van der Waals forces, changes in the surface hydrophobicity or conformational changes of the adsorbed molecules play an important role in the final bending.[1],[2] The easiest and most extended model to study the surface stress produced on cantilevers is based on the work of G.G Stoney in
Application of 1,3-PDO, Production of 1,3-PDO
1,3-PDO is the monomer of polytrimethylene terephthalate.
It is widely used as the raw material of cosmetics, food, textile, lubricants, and medicines.
The yield of chemical method to produce 1,3-PDO is low, and there are many by-product by using chemical production of 1,3-PDO. As a result, it is difficult to produce 1,3-PDO by chemical method.
Solid Oxide Fuel Cell의 약자로 고체 산화물형 연료전지
- 양극재료 (Cathode materials)
환원 시 높은 전기전도도를 가져야 하며, 연료 연소 시 촉매 반응이 일어나야 한다. 전해질과의 계면에서 화학적 안정성이 있어야 한다.
- SOFC의 장점 & 단점
장점 : Anode가 CO poisoning에 영향 받지 않고 Pt와 같은
Ⅰ. 측정과 라돈측정
1. 고체비적검출기를 이용한 라돈측정시스템
검출기홀더 내에서 라돈과 라돈자손의 붕괴로 방출되는 알파입자는 방출된 위치에서의 초기에너지로부터 연속적인 에너지 스펙트럼을 지닌다. 이들 알파입자가 검출기로 입사하면 검출기에는 알파입자의 궤적을 따라 잠재적으로
chain. These basic structural properties play a major role in determining bulk physical properties of the polymer, which describe how the polymer behaves as a continuous macroscopic material. Chemical properties, at the nano-scale, describe how the chains interact through various physical forces. At the macro-scale, they describe how the bulk polymer interacts with other chemicals and solvents.
2. Objective
1) To investigate of solid-liquid mixture flow characteristics in a slim hole annulus
2) Effect of pipe rotation, fluid property, annulus inclination on the particle transport velocity, transport efficiency and pressure drop
3. Theoretical background
3.1 Reynolds number
Reynolds number can be defined for a number of different situations where a fluid is in relativ
1. What’s HEMT?
- High electron mobility with heterojunction structure
(Prevent Coulomb scattering with no doping materials)
- High thermal stability
- High Breakdown voltage
2. 2DEG
- Discontinuity through the conduction band of the two semiconductors determines a charge transfer,
creating a triangular potential.
3. Polarization
- AlGaN/GaN HEMTs tra
PVAc (Poly vinyl acetate)
A rubbery synthetic polymer
with the formula (C4H6O2)n
A hard, colorless, and nontoxic substance.
An intermediate product in the synthesis of polyvinyl alcohol.
Emulsion Polymerization
starts with an emulsion incorporating water, monomer, and surfactant.
Advantage
- High molecular weight polymers can be made.
- Heat can be removed
Measurement of Density
The mass is normally measured with an appropriate scale or balance.
The volume may be measured directly (from the geometry of the object) or by the displacement of a fluid.
Hydrostatic weighing is a method that combines these two.
2. Specific Gravity
It is the ratio of the density (mass of a unit volume) of a substance to the density of a given reference materia