A Wisdom Archive on tension

Worry causes fear, anxiety, tension and stress. These emotions deplete energy and weaken the immune system. Worriers become sick and this is manifested in poor health, because of all the problems that are eating into their vitals.
 
And worry is certainly not the same as constructive thinking; if it were, we would have found solutions to most of our problems.

 
(See also: Love and Happiness, Life and Beyond, Body Mind and Soul )

Read more here: » Love and Happiness: Don't Be a Worrier; Savour Your Life

The word relaxation can mean the following: The opposite of stress or tension; the aim of recreation and leisure activities. The transition of an atom or molecule from a higher energy level to a lower one (as in dielectric relaxation). In music, the release following musical tension. Other related archivesatom, dielectric relaxation, energy level, leisure, molecule, music, recreation, stress, tension

Read more here: » Relaxation: Encyclopedia - Relaxation

The simplest oscillating system is a mass, subject to the force of gravity, attached to a linear spring. The system is in an equilibrium state when the weight of the mass is balanced by the tension of the spring. If the system is displaced from the equilibrium, there is a net restoring force on the mass, tending to bring it back to equilibrium. However, in moving the mass back to the equilibrium position, it has acquired inertia which keeps it moving beyond that position, establishing a new restoring force, now in the opposite sense. ...

Read more here: » Oscillation: Encyclopedia II - Oscillation - Simple systems

Beam bending is analyzed with the Euler-Bernoulli beam equation. The classic formula for determining the bending stress in a member is: σ is the bending stress M - the moment at the neutral axis y - the perpendicular distance to the neutral axis Ix - the second moment of inertia about the neutral axis x This equation is valid only when the stress at the extreme fiber (i.e. the portion of the beam furthest from th ...

Read more here: » Bending: Encyclopedia II - Bending - Stress in a beam

Chain lubrication is a common problem for cyclists. Liquid lubricants penetrate to the inside of the links and are not easily displaced, but quickly attract dirt. "Dry" lubricants, often containing wax or Teflon, have poor penetrating qualities unless carried in an evaporating solvent, but stay cleaner in use. The cardinal rule for long chain life is never to lubricate a dirty chain, as this washes abrasive particles into the rollers. Chains should be cleaned before lubrication. An alternative approach is to change the (relatively cheap) cha ...

Read more here: » Bicycle chain: Encyclopedia II - Bicycle chain - Maintenance

At the start of a match, a coin is tossed. The side that wins the toss may choose whether to serve first, or may choose which end of the court to play. The other side exercises the remaining choice. In less formal settings, the shuttle may be hit into the air to determine which side serves: the shuttle lands pointing to the serving side. Scoring The first player or pair to reach 15 points (11 points for women's singles) wins the game. If the score reaches 14-all (10-all for women's singles) the receiving side can choose ...

Read more here: » Badminton: Encyclopedia II - Badminton - The Rules

The first metallic glass was a gold-silicon alloy, produced at Caltech by Pol Duwez in 1957. This and other early glass-forming alloys had to be cooled extremely rapidly (on the order of one megakelvin per second) to avoid crystallization. An important consequence of this was that metallic glasses could only be produced in a limited number of forms (typically ribbons, foils, or wires) in which one dimension was small so that heat could be extracted quickly enough to achieve the necessary cooling rate. As a result, metallic glass specimens (with a few exceptions) were limited to thicknes ...

Read more here: » Amorphous metal: Encyclopedia II - Amorphous metal - History

Iron was in limited use long before it became possible to smelt it. The first signs of iron use come from Ancient Egypt and Sumer, where around 4000 BC small items, such as the tips of spears and ornaments, were being fashioned from iron recovered from meteorites (see Iron: History). About 6% of meteorites are composed of an iron-nickel alloy, and iron recovered from meteorite falls allowed ancien ...

Read more here: » Steel: Encyclopedia II - Steel - History of iron and steelmaking

The bridge must transfer vibration to the sound board or other amplifying surface. It does this as follows As the strings are set in motion, the bridge moves in a bending to and fro motion along the string direction, at twice the rate of the string vibration. This causes the sounding board to vibrate at the same frequency as the string producing a wave-like motion and a audible sound. Bridges are designed to hold the strings at a suitable height above the fingerboard of the instrument. The ideal bridge height is one that creates suffi ...

Read more here: » Bridge instrument: Encyclopedia II - Bridge instrument - Operation

Arch bridge - Advantage in use of simple materials. Stone and other such materials are strong in compression and somewhat so in shear, but cannot resist much force in tension so masonry arch bridges are designed to be constantly under compression. In the first compression arch bridges, a keystone in the middle of the bridge bore the weight of the rest of the bridge. The more weight that was put onto the bridge, the stronger its structure became. Masonry arch bridges use a quantity of fill (typically loose rubble) ...

Read more here: » Arch bridge: Encyclopedia II - Arch bridge - Simple compression arch bridges

The effort and difficulty of a rescue varies widely and depends on many factors such as the nature of the problem, the underwater conditions and the type and depth of the dive site. A simple rescue could be to tow to safety a diver on the surface who is exhausted or suffering from leg cramps. A complex and high-risk rescue would be to locate, free and bring to the surface a lost diver who is trapped underwater in an enclosed space such as a ship ...

Read more here: » Diver rescue: Encyclopedia II - Diver rescue - Rescue activities

Lighting design as it applies to the built environment, also known as 'architectural lighting design', is both a science and an art. Proper comprehensive lighting design requires consideration of the amount of functional light provided, the energy consumed, as well as the aesthetic impact supplied by the lighting system. Some buildings, like surgical centers and sports facilities are primarily concerned with providing the appropriate amount of light for the associated task. Some buildings, like warehouses and office buildings, are primarily ...

Read more here: » Lighting: Encyclopedia II - Lighting - Lighting design

List of ICD-9 codes - Intestinal infectious diseases 001-009. (001) Cholera (002) Typhoid and paratyphoid fevers (003) Other Salmonella infections (003.0) Salmonella gastroenteritis (004) Shigellosis (004.9) Shigellosis, unspec. (005) Other food poisoning (bacterial) (005.0) Staphylococcal food poisoning (006) Amoebiasis (006.0) Acute amoebic dysentery without mention of abscess (006 ...

Read more here: » List of ICD-9 codes: Encyclopedia II - List of ICD-9 codes - 1. Infectious and parasitic diseases 001-139

There are well over 150 different types of massage therapy. Various styles of massage have developed from a number of sources. Massage - Breema. Breema bodywork is performed on the floor with the recipient fully clothed. It consists of rhythmical and gentle leans and stretches which leads to deep relaxation, increased vitality, and stimulation of the self-healing processes of the body. Sessions can be any length of time, although 50 minutes is common. There are also self-Breema exercises. The essence of Br ...

Read more here: » Massage: Encyclopedia II - Massage - Types of massage

The need to standardize pitch levels, at least within one city or country, rose as performance of music which combined the organ with instrumental ensembles became more popular. One way in which pitch could be controlled was with the use of tuning forks, although even here there was variation - a tuning fork associated with Handel, dating from 1740, is pitched at A = 422.5 Hz, while a later one from 1780 is pitched at A = 409 Hz, almost a semitone lower. Nonetheless, there was a tendency towards the end of the 18th century for the frequency of ...

Read more here: » Pitch music: Encyclopedia II - Pitch music - Need to standardize pitch