Untitled

[jamesswordresearch]

A concave or converging mirror reflect light from inside its surface. While convex or converging mirror reflect light from outside its surface.

The nature and position of the images formed by curved mirrors, could also be found with the aid of ray diagrams drawn to scale , employing the following rule:

* A ray parallel to the principal axis passes through the principal focus.

* A ray through the centre of curvature is reflected back along the same path.

* A ray passing through the principal focus must be reflected parallel to the principal axis.

[jamesswordresearch]

An electronic component symbol, is a pictogram used to denote various electrical and electronic devices or function in a circuit diagram.

Electronic symbols are essential to know while designing circuit for a project. These symbols are largely standardized internationally, by American National Standard Institute, and International Electrotechnical Commission to signify the component.

This video gives an overview of basic electronic circuit symbols such as:

Capacitors (polarized, non polarized, variable etc)

Power supply symbols ( AC, DC, Battery, Transformer etc)

Diodes ( LED, Zener, photodiode, Tunnel, schottky)

Meters ( Ammeters, galvanometer, voltmeter etc)

Resistors (variable resistor, potentiometer)

Transistors (NPN, PNP, Phototransistor, Field effect transistor etc)

Switches (Push switch, SPST, SPDT, DSPT, DPDT)

Inductor

[jamesswordresearch]

A rotary kiln is a pyroprocessing device used to cause a chemical reaction or physical change in a solid material through the application of high temperature.

Materials produce using rotary kiln include:

Cements

Refractories

Metalworking

Titanium oxide

Alumina

Vermiculite

Iron ore pellets etc.

The basic Components of a rotary kiln include:

The shell,

Refractory lining

Support tyres and rollers

Drive gears

Heat exchangers.

Four stages in the manufacture of Portland cement:

Crushing and grinding the raw materials

Blending the raw materials in the correct proportions

Burning/calcining the mixture in a kiln

Grinding the clinker together with some gypsum.

[jamesswordresearch]

Corrosion is the chemical and electrochemical destruction of metal or alloys by the surrounding damp and humid environment.

- Types of corrosion include:

Uniform, crevice, pitting, stress corrosion cracking, galvanic, erosion, microbial, selective dissolution (de alloying), fretting corrosion etc.

- Factors affecting corrosion are:

position of metal in electrochemical series, presence of impurities, exposure of metal to salt water, temperature, concentration of oxygen etc.

- Examples of corrosion are:

rusting of iron, tarnishing of silver, copper corrosion etc.

- Rate of corrosion:

weight loss method is used to measure corrosion rate.

- General method to prevent corrosion include:

galvanization, electroplating, painting, oiling & greasing, anodization, periodic cleaning etc.

[jamesswordresearch]

There are Noble reasons to embrace the green movement. You'll protect natural resources, reduce pollution and help to save the planet.

Living sustainably can be easy and fun. This might seem contradictory, as many people think that going green means spending more.

But going green to save money doesn't have to be difficult, expensive or time consuming, and it can result in more savings than you might expect.

In this video is a list of some examples to a sustainable lifestyle, that will not only go easy on the planet but will also go easy on your wallet too.

[jamesswordresearch]

Creep is the tendency of a material to change form overtime after facing high temperature and stress.

A creep test measures the progressive rate of deformation of a material at high temperature.

It is conducted using a tensile specimen to which a constant stress is applied at a constant temperature often by a simple method of suspending weight from it

There are three stages of creep

* Primary creep: starts at a rapid rate and slows with time

* Secondary creep: has a relatively uniform rate

* Tertiary creep: has an accelerated creep rate and terminates when the material breaks or ruptures.

[jamesswordresearch]

A flow meter is a device that measures the flow rate of a fluid. They measure the linear, non linear, mass or volumetric flow of a gas or a liquid. Flow meters are known as flow gauges and flow measurement instruments.

There are two broad types of flow meters widely used in industries;

1. Volumetric flow meters 2. Mass flow meters.

Volumetric flow meter measures the fluid volume passing through a specific location in a set period of time.

various types of volumetric flow rates available are;

- Differential head type ( orifice plate, venturi meters, annubar, rotameter etc)

- Electromagnetic flow meters

- Ultrasonic flow meters

- Turbine flow meters

- Vortex flow meters

- Positive displacement meters.

Mass flow meters measure the mass flow rate that travels through a tube per unit of time. There are two types of mass flow meters;

- Coriolis Mass flow meter

- Thermal mass flow meter.

[jamesswordresearch]

Most people do not realize, that there were no honey bees in America before European settlers brought hives from Europe. The bumble bee and other bees, have been pollinating the continent flowering plants since long before the arrival of honey bees.

The honey bees, remarkable as it is, does not know how to pollinate tomato or egg plant. It does very poorly compared to other bees, when pollinating some plants such as pumpkins, cherries, blueberries, cranberries etc.

[jamesswordresearch]

Metals are of such social and historical important, that two eras are named for them. The bronze age and the iron age.

The development of metallurgy, had a profound effect upon the environment and the relationship between human and nature. Wherever iron was introduced, deforestation and an increase in agriculture followed.

This video describes how metallurgy, developed an order related to the properties of the metals available to human beings. And an increasing human knowledge of these properties, makes the current information age possible and continue to shape our lives.

[jamesswordresearch]

Microbes are the oldest form of life on our planet. They are an extremely diverse group of organism and in terms of species numbers, they represent the most abundant life form on this planet.

2021 was another amazing year in discoveries, as scientist made a slew of fascinating discoveries about the microscopic organism living in and all around us.