The wealthier Viking could afford a metal helm, a chainmail byrnie, a coat of animal skins and of course his shield. This was made of wood, about five eighths of an inch thick, faced with cow hide with a metal boss in the centre.

The sword itself was between two and three inches wide at the hilt, double edged, so it was good for cutting and slashing, but it also tapered to a point, so it could be used for thrusting as well. A wide, central fuller ran the length of the blade. Virtually all Viking swords had a heavy pommel on the end of the handle as a counter-weight, which made handling easier.

Because of work carried out at England’s National Physical Laboratory, it’s now known that a lot of sword blades were made in Herat, the old name for Afghanistan. The overall length of the sword was about 36″, the blade itself about 30″. It weighed about two and a half pounds. Norse law laid down that Vikings had to carry their swords at all times. The blades themselves were pattern welded, laminated from high and low carbon steel. The high carbon steel gave the sword its sharpness and durability, while the low carbon steel gave flexibility.

Vikings of high status would have their swords ornamented with silver and gold accents and inlays, while their scabbards would be decorated in the same way. The inside of the scabbard was normally lined with sheep’s wool. This acted as an excellent lubricant and prevented rust from forming on the weapon.

The National Physical Laboratory, N.P.L., analyzed Viking swords that had been found in funeral sites, rivers, etc. They used a powerful scanning electron microscope which showed that many swords were made of imperfectly melted steel consisting of a mixture of iron and carbonaceous materials which, when heated together, gave them high carbon steel.

The interesting part is that N.P.L’s. results agree with descriptions of ancient sword making in Herat, described by the Arab writer/philosopher Al-Kindi. This links to a known Viking trade route down the Volga and across the Caspian Sea to Iran. Until this discovery, it wasn’t known that Vikings had brought crucible steel back to Scandanavia and integrated ancient Arab steel making methods with their own swordsmithing.

The top of the line swords were made by a gentleman named Ulfberht. His name is in raised letters on the hilt. He’d be the equivalent to Colt, or perhaps Heckler & Koch today!

Not only that, but certain swords that have been recovered have been judged good enough to be used in combat today. That’s quite a tribute to the swordsmith who fashioned the weapons all those centuries ago.

Analytical balances are used in laboratories not only to weigh small quantities but also, with the use of density determination kits, to calculate the density of liquids and solids. Depending on the particular model these precision instruments have a maximum weighing range of 83 to 320 grams and readout of 0.1 milligram. This makes them eminently suitable for density determination exercises. Once programmed the analytical balance exhibits the density or specific gravity on its large liquid crystal display. Data can be transferred to a PC or printer using an RS 232 interface for record-keeping.

Setting up a Density Determination Kit

Cotton gloves should be worn by laboratory technicians setting up and operating a density determination set. This is because oil on fingers can transfer to the object being studied and influence weight, and because oil can cause bubbles as small as 1 mm3 that can increase buoyancy on small specimens, resulting in a reading error.

Different analytical balances will have different procedures for density determination, so instructions should be carefully followed. Many balances can be programmed to measure solids or liquids. Here is a brief on setting up the balance for density determination:

1. Turn off the analytical balance and disconnect it from its power source.

2. Remove the balance grading ring, weighing plate and platform.

3. Place the density determination kits weighing platform and vertical rack assembly into the weighing area of the balance. The rack assembly supports a sample dish used when weighing in air and a suspended mesh sample holder for weighing in liquid.

4. Center the kits glass beaker platform over the weighing platform in such a way that it does not touch the weighing platform and center the beaker on its platform.

5. Carefully install the weighing platform assembly consisting of the sample dish and mesh sample holder so that it is suspended in the beaker, then install the thermometer.

The analytical balance may then be connected to its power supply and density calculations can proceed by following the instruction manual.

Born in 1962 at the Naval Ordinance Laboratory in the US, nitinol was discovered by two scientists William Buehler and Frederick Wang. Two distinct properties were attributed to its discovery namely shape memory and super elasticity characteristics. These two interesting characteristics added to its existing properties of being a very sturdy and resilient metal. Shape memory is characterized as the ability of nitinol to return to its original form after being deformed while super elasticity gives the ability to withstand intense high temperature. As compared to other metal alloys, nitinol is probably the most elastic alloy.

The tremendous coverages of nitinol’s applications were easily recognized by the scientists however, the effort exerted towards its manufacture was seen as tedious and time-consuming hence it took a decade before it was introduced to the public for commercial use. Despite its difficulty in manufacturing, this alloy remained immensely expensive hence only selected institutions such as elite laboratories and scientific facilities that were well-funded were able to utilize it. Only until the last couple of decades that the production costs of nitinol has become affordable for small manufacturers. Since its introduction to the commercialized market, it has proliferated various industries and areas of knowledge. In particular, this amazing alloy was used in robotics and advance medical procedures.

The development of robotics seemed unstoppable since its concept was introduced. We saw different models with different innovations particularly when it comes to computing which was focused on artificial intelligence. Despite the successes, there was one thing that challenged the industry of robotics; it can hardly imitate humans specifically its flexible movements. There seemed to be a scarcity of the materials that would enable scientists to imitate this particular characteristic. This problem was resolved when they learned about the distinct characteristics of nitinol particularly its ability to return to its original form without breaking and its ability to withstand temperature transformation states. This alloy enabled robots to form a muscle like component which makes it resemble human flexibility.

Stiquito was one of the earliest and famous robots that were invented for educational purposes. It was the first to take advantage of nitinol technology; a six-legged robot that utilizes nitinol as its armatures which contracts and expands when subjected to high temperature. It was used in classroom demonstrations to educate students about different subjects such as metallurgy, electronics, computer controls and artificial intelligence.

Robotics is just one area that nitinol technology has invaded. There are several fields which are taking advantage of its distinct characteristics. You can expect more and more discoveries and innovation towards the use of nitinol. In the future, there shall be more advancement in different fields of science and technology which involves the manufacture of alloys.

Reverse osmosis is also referred to as RO. Reverse osmosis is a system that helps to purify your water. It is kind of like a filtration system but a slightly different process. The Ro works by forcing the through the membrane and then it keeps the solute on one side and then it lets the purified water thru. It is different from the filtration system because the filtration system uses a straining method to purify the water.

When they are talking about membranes it starts to sound very medical. What a membrane is a substance that only lets certain materials or ions pass thru to the other side. There are different kinds of membranes. The different types are selectively-permeable membrane, a partially-permeable membrane, or a differentially-permeable membrane. There are different things that affect the rate of passage. The three factors that can affect the rate of passage are the pressure, the concentration, or the temperature.

Some of the benefits of having this system in your home is it helps to purify the water that you use in your kitchen. This is very beneficial toy you and your family because the water that comes from the kitchen is where you get your drinking water from and it is also where you get the water that you use to cook your food with. How it helps your water is it helps to improve the taste of your water. It also helps with the color of your water and also the properties of your water. Some of the things that this type of process removes is it removes salt and any impurities.

This kind of process can be very beneficial to you and your family’s health because it helps to remove some dangerous chemicals that can end up in your drinking water. Some of those dangerous chemicals that this process helps to remove are the hexavalent chromium, radium 226/228 and lead. All of these chemicals can be very harmful to you and your family.

Indeed, there could be something similar to the ocean currents of Earth. Consider the circulation of gases, dust, debris, etc – moving around, in fact this makes the potential for planetary formation. So one has to ask if planets can be formed within the Lagrange points or gravitational equilibrium areas between two large bodies as the accumulation of space debris is held together? It very well could be at least one way that plants are formed.

A plan formed in a Lagrange area could also end up being a moon of a planet that caused Lagrange point in the first place. Or if it escapes the Lagrange region for some reason during an unstable era, it could become a planet orbiting a sun. To test this theory it would be important to know what type of vortex flows occur Within Lagrange Equilibrium Boundaries, as the various minerals and elements combine with compounds of gas and debris.

Perhaps it is time that we spend a little extra money in our space program and go explore some of these more stable Lagrange points to find out the answers to such questions. The circulation and movement of the debris clouds within these areas will tell us a lot about how things work in our solar system, how things came to be, and give us clues to the origins of such. Please consider all this.

Thankfully about 3 weeks before my exams I came across a test bank of anatomy and physiology questions. My test scores totally changed, I went from getting low C’s to getting A’s every time! I quickly discovered that it was the only way to learn this tough subject. My only regret was that I did not discover this tip sooner.

There are generally 12 systems of the body that you need to learn including:

* The Cell
* The Skin
* Muscles
* Skeletal System
* Circulatory System
* Lymphatic System
* Endocrine System
* Nervous System
* Digestive System
* Respiratory System
* Reproductive System
* Urinary System

Based on my experience you have to constantly memorize the terms. Anatomy and physiology questions are a perfect way to do this. The idea is to go over each question again and again until your confidence grows. When I was studying I would take a group of about 50 questions and go over these for one week. Once that week was over I would test myself. This way I knew what areas were my strongest and what areas were my weakest. Writing the questions on index cards is a great tip. This means you can carry them around with you wherever you go. Great for the commute to and from work/college!

As well as having anatomy and physiology questions, finding puzzles or quizzes that test your knowledge, are a fantastic addition to your studies.

She is also the first woman who won the Ph.D. in research science in Europe, and also the first woman professor at the field of Sorbonne.

Marie Sklodowska was born in war saw, the city of Poland, where her father was a teacher.

Polish teachers were not well paid, and Marie’s father could not afford a university education for her, so she had to work as a governess.

She succeed in separating polonium from radium, and made known of the nature of radiation and beta rays which are widely used in medical and other fields.

When she had enough money from her saving, she went to study at the most famous French university, the Sorbonne in Paris. She had a very difficult life in Paris, but graduated with honors in physics and mathematics. Then she got a job as a research scientist. While she was doing her research, she met Pierre Currie. Her friendship with this French scientist resulted in their marriage in 1895. They worked together and discovered radium. In 1903 Marie and Pierre won the Nobel Prize for physics. A few years later in 1906, Pierre was run over in the street by a wagon and died of his injuries. But Marie continued to work and won another Nobel Prize again in 1911.

Having considered Hubble’s expanding universe, incomplete without an inception event, and the now mainstream multiverse theory pulling us rapidly towards a range of answers, this is a bad time to loose funding. Such research is common in the modern peer group of garden room doctors: the ever expanding number of doctors and scientists who are ordering private research rooms for establishing and enhancing their theories. Given the current expansion in cosmology, it may be logical to conclude that future theories manifesting from these quiet spaces could constitute a breakthrough.

The cabin-like character of the space is ideal for deep thought. Removed from the shadows, disturbance and noise of other buildings, the detachment of garden research rooms allows them a personal study, “My Space”, ambience. Custom made to order, these buildings allow intensive work of exceptional depth and quality, partly due to their high thermal and sound insulation – distraction barriers. Those committed to cosmological development have exactly the right atmosphere to finalise their theories.

With funding problematic, venues need not be a problem at all when garden rooms of this quality and cost exist. Rapid-build structural technology lets the research continue, unimpeded. I want to know why and how we came to be, not content with Darwin’s brilliant but vague conclusion, that we are all descended from one cell. Wonderment and intelligent passion are fast closing on black hole bounces, cyclical like our seasons, bringing religious doctrines together in a genesis meets nirvana moment of truth.

Love and Compulsive Disorder – Well, you would be amazed to know that love and extreme obsessive compulsive disorders are bio-chemically the same. The scientists have discovered that in both these psychological conditions common neuro-chemical changes take place which involves the 5-HT structure. This unusual fact was discovered by Donatella Marazziti, Alessandra Rossi, Giovanni B. Cassano and Hagop S. Akiskal.

Asthma and Roller Coaster Ride – Few symptoms can be cured by making use of Roller Coaster Rides. This was discovered by Simon Rietveld and Ilja van Beest in the year 2006. Both these scientists belonged to Netherlands. They have found that the positive emotional stress induced by roller coaster rides has a tendency to interfere with dyspnea, a condition which is characterized by difficulty in breathing.

Listening to Muszak Stimulates Immune System – When muszak is being played in the background in public areas it not only entertains the mind but also helps in stimulating the human immune system. This further helps in prevention of common cold. This discovery was made when Carl J. Charnetski, Francis X. Brennan, Jr., and James F. Harrison in the year 1990 were examining the effects of music and auditory stimulus on the immunoglobulin A in the human body.

Einstein’s discovery

Einstein got the Nobel for physics in 1921. Photo electric effect is a phenomenon where metals emit electrons from their surface when light shines upon them. Einstein explained this phenomenon as follows:

- Light consists of small particles called photons. They carry energy proportional to the frequency of light. – When light shines upon the metals, the electrons absorb the energy from the photons and they get rejected because of the energy difference. This causes the electron flow.

Einstein’s discovery led to the understanding that light behaves both as particle and wave.

Applications

The discovery of photo electric effect led to the development solar cells, now useful as the alternate source of energy for us. Similarly photo diodes are another application, which find wide usage in light detection in the areas of fiber optics, telecommunication and other areas.

World year of physics

1905 represented a very important year in physics with four groundbreaking publications by Albert Einstein during that year.

These four publications are:

1) about photo electric effect

2) Brownian motion

3) Special theory of relativity

4) The famous mass and energy equation E=mC2

These publications especially the special theory of relativity completely changed the course of physics during the later years. The mass and energy equation led to the development of atom bomb as well as constructive nuclear power. Highlighting the significance of 1905 as an important milestone in Physics, year 2005 was recognized as world year of physics on the occasion of 100th anniversary of Einstein’s publications.

Later years

In later years, Einstein also added another publication ‘general theory of relativity’ and worked on his unified field theory. The general theory of relativity was not accepted by many at the time he published in 1915. The concepts and the calculations behind the theory were quite complex and it was not understood by many. He suggested that his calculations can be verified during a solar eclipse. After a few years, during an eclipse, observations were recorded which proved his theory correct. This made him even more famous.

Einstein’s mass energy equation was utilized to develop the atom bomb. Einstein was not involved in making the bomb. He spoke against the war and continued on using technology for peace until his death in 1955.