Low Back Pain - A Quick Guide

Low back pain is a common disorder affecting millions of individuals annually. It is a common musculoskeletal disorder that affects the lumbar segment of the spine, which is the lowest part of the back just above your buttocks. It is one of the most common causes of missing work, and can affect anyone of any age, race, or sex. It is one of the top 10 reasons patients seek care from a doctor.

Low back pain is typically classified as either acute or chronic. Low back pain is often accompanied by stiffness and difficulty with normal movement, muscle spasms, and pain that becomes worse with any type of straining. If it is particularly bad it may cause pain down the back of your leg, which is called sciatica.

Chronic Back Pain

Chronic low-back pain is a very common problem for which there is currently no universally effective treatment. Chronic back pain is generally defined as pain that persists for more than three months. Chronic pain is much less common than acute pain. It usually has an insidious onset, occurring over a long period of time. It can also occur in people whose work involves heavy lifting, bending, and long periods of standing on a daily basis. It also may originate from an injury, disease or stresses on different structures of the body such as osteoarthritis, rheumatoid arthritis, degeneration of the discs between the vertebrae, or a spinal disc herniation, a vertebral fracture (caused by osteoporosis), or rarely, a tumor (including cancer) or infection. Chronic low back pain can be shooting, stabbing or localised in nature. It can also be referred from another part of the body.

Acute Back Pain

Acute pain is the most common type of back pain. Acute back pain is short term, generally lasting from a few days to a few weeks. Acute pain comes on quickly and often leaves just as quickly. The commonest reasons for acute lower back pain are damaged muscles, ligaments and tendons in the lower back. Acute back pain can also be caused by kidney stones, pelvic inflammation and even some bowel conditions like constipation, inflammatory bowel disease or diverticulitis may have some back pain associated with it. These are much less common.

Back Pain Symptoms

Symptoms of low back pain depend upon the cause of the pain. Damage to muscles and ligaments causes pain, back muscle spasm, pain on walking, difficulty twisting, stiffness and sometimes pain worse on one side rather than the other. Pain caused by nerve irritation often also causes sciatica. Sciatica is pain down the leg or legs caused by irritation to the sciatic nerve in your back. It is often caused by disc problems, arthritis and severe muscle damage and spasm.

Treatment

Treatment for back pain generally depends on what kind of pain you experience: acute or chronic. Treatment options range from basic rest but only for 24 hours, ice or heat and gradually resuming activity to medication, exercise, physical therapy and acupuncture. Using trans-cutaneous electrical nerve stimulation (TENS ) with both acute and chronic pain can speed recovery and reduce pain. acupuncture like TENS is excellent for treating muscle spasms and the trigger points often found in back muscles.

Treatments for chronic back pain can vary greatly depending on the type and source of the pain. many sufferers find TENS a great help in reducing symptoms. If the problems persist an operation is often required to relieve the pressure on the disc and reduce nerve irritation.

exercises

Having used TENS to reduce pain exercises that increase balance and strength can decrease your risk of further back pain. exercises such as Tai chi, yoga or any weight-bearing exercise that challenges your balance are good ones to try. String back and abdominal muscles can lessen pain. exercises to reduce low back pain are not complicated and can be done at home without any special equipment.

Andy Duncan is a doctor and freelance medical writer. For more information on pain and TENS machines please visit www.pain-rehab.co.uk

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Xbox 360 So Hot It Can Be Liquid Cooled by Cool IT Systems

Some of the top gammers who drive their xbox 360 Machines hard due to their intense level of play have found themselves over heating their systems. The answer for these top Guns of the virtual world and heroes of their own augmented reality to do? The answer is liquidity; that is to say a liquid cooled xbox 360 system made by cool IT Systems.

Thats right liquid cooled for those who run their machines full tilt for hours on end with the fastest and most exhilarating games. As long as they have enough brainpower and quick reflexes to go beyond what normal mortals can do, now they have a viable solution. A word of advice for those gammers, you also need to cool your human brain and feed it properly. We recommend high calorie, protein and glucose intake in an environment well ventilated with plenty of oxygen too.

Currently the standard cool IT Systems Xbox 360 intercooler with liquid cooling technologies uses the power from the xbox 360, but in future models it may need to be hooked up to its own power source as the games get more robust and the gammers become even more intuitively aggressive. xbox 360 is just too hot to handle, too hot to stay on the shelves and way too hot for Sony play station to ever catch a clue that they are about to be lapped. CoolIT Systems liquid cooling; install this in 2006!

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Metal Roofing as Cost Effective Solution

In the past metal roofing was considered the luxury that could not be availed by all the home owners. Only the ones could this who could afford to hire a professional contractor to install the roof. But nowadays more and more people are attracted towards doing their homes roofing themselves. Metal roofing has proved to be the ideal choice for the low pitched roofs. In the low pitched roofs, metal sheets are sealed together and placed on the roof. Of course there are some positive as well as negative aspects of having the metal roofs but not if you chose the better metal roofing solution for you according to your needs and environmental conditions.

Metal Roofing Ideal for Low Pitched Roofs

Metal roofing is considered ideal for the low-pitched roofs because it comes with many benefits like metal roofing can fairly cope with the extreme weather, it has less weight and is exceptionally durable and it is non-combustible. These things add more value to the beauty and the good look of the metal roofing.

Metal roofing is also considered to be ideal for the low pitched houses because it comes in a variety of metals like aluminum, zinc, copper and stainless steel. The metal is selected according to the environment and weather. These metals can be colored to any shade according to the needs of the building and desire of the owner. Also these metals can be repainted too.

Metal roofing is extremely durable and is corrosion resistant. They are light weight therefore they do not inflict any damage to the inner materials of the roof. Once installed, the metal roofing does not need to be changed for more than 50 years and they are covered by warranties that long. Metal roofing solution is cost effective as it does not need much maintenance. Also this keeps you free of any worries about your roof anymore. Metal roofs are also pest-resistant.

Low pitched roofs are mostly flat or they have lower slopes therefore they should have the way for water to sweep down. This is also made easy by the metal roofing as they are completely safe in all the weathers like rain, snow, hail and heat.

Installation of the Low Pitched Metal Roof

Home owners should consult the professional contractors to get the metal roof installed for their low-pitched roof to avoid any future complications like drainage problems and other installation issues which can rise if you attempt to install the roof on your own.

You can also find more info on sheet metal and structural metal roofing. Homeroofinghelp.com is a comprehensive resource to known about metal roofing.

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X-Box, Does It Have Staying Power?

X-box is Microsofts future-generation video game system that delivers the most powerful gaming experience ever. X-box empowers game artists by giving them the technology to fulfill their creative vision as never before by creating games that blur the lines between reality and fantasy. microsoft X-box is a sixth video game console of era was initially released on November 15, 2001 in North America, then released on February 22, 2002 in Japan, and on March 14, 2002 in Europe.

Looking for the ultimate gaming console? Your search stops here. X-box 360 is fully loaded. It is the unsurpassed gaming and entertainment experience for the best value. X-box 360 Core system delivers the same powerful gaming as X-box 360 but starts with the basics just plug in the console and the controller and you are playing. You can then decide what else to add. It is expandable to the full X-box 360 pro console setup.

How does X-box differ from X-box 360? There are quite a few differences between the X-box and its later model. The question depends on who is asking. Is this person someone who simply wants to be able to play a video game at home during their past time or someone who is into technology and is always out to get the latest model of gizmos? The design of the new X-box 360 is supposed to be able to work better with HDTVS. This is to keep up with the latest state -of - the- art gaming consoles out there.

Will X-box be beat by another competitor? Maybe, ps3 which can be used to watch movies, play music, and surf the web. It has a dual ethernet, built in wi-fi, Bluetooth, flash memory slots and blue ray. ps3 has hardware that is more powerful than that of X-box 360 and will be able to produce real to life visuals. ps3 games will be stored on Blu-ray discs which store 54 gigs while game space in the X-box 360 is just 9 gigs.

Even though X-box may not be the big boy on the block anymore, we have yet to be see whether or not it will just fade away in the background of its competitors.

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Does a Non-Profit 501(c)(3) Realize Unrelated Business Taxable Income (UBTI) For Advertising?

non-profit organizations which are exempt from income tax under 501(a) are subject to tax on unrelated business income. 501(b), 511. Unrelated business income is gross income derived by any organization from any unrelated trade or business, regularly carried on by it, less the deductions allowed. 512. An unrelated trade or business is a trade or business which is not substantially related (aside from the need of such organization for income or funds) to the purpose of the organization. 513. However, unrelated trade or business does not include a trade or business where substantially all the work is performed for the organization without compensation. 513(a)(1). see Rev. Rul. 75-201, 1975-1 CB 164.

The sale of advertising in a publication published by an exempt organization is an unrelated trade or business when the advertising activity is regularly carried on. Reg. 1.512(a)-1(f)(1). see also Rev. Rul. 73-424, 1973-2 CB 190.

Courts have held advertising revenue not to constitute unrelated business income in some circumstances. For example, in national Collegiate Athletic Assn. V. Comm., (1990, CA10) 66 AFTR 2d 90-5602, 914 F.2d 1417, 90-2USTC 50513, revg (1989) 92 TC 456, advertising revenue received by the NCAA from the sale of programs of its annually sponsored championship tournament was not unrelated business income where the tournament lasted less than three weeks and occurred only once a year.

IRS Chief Counsel strongly disagrees with the Tenth circuit. The IRS argues the state court should have taken into account the time spent soliciting the advertisements and preparing the advertising for publication. IRS announced it will continue to litigate the issue in appropriate cases. action on Decision 1991-015, 7/3/91.

IRS distinguished NCAA where a state university received income from advertising placed in its football souvenir programs. Here, a significant time span was involved over which the activities were conducted. The football season lasted three months and the work in setting up the programs and soliciting adverting took even longer. IRS letter ruling 9137002.

Assuming that the journal is published periodically throughout the year, an exempt organization should not rely on national Collegiate Athletic Assn. The periodic publishing and on going solicitation efforts will likely constitute a unrelated business regularly carried on. see 512.

The court also held advertising revenue does not constitute unrelated business income in US v. american college of Physicians, (1986 S.Ct). In american college of Physicians, the court found that the advertising business contributes importantly to the universitys education program through the training of students.

Also, advertising revenue does not constitute unrelated business income if the advertising contributes to the organizations purpose. For example, publication of legal notices in a bar association journal contributes to the associations exempt purposes by promoting the common interest of the legal profession through providing a single source of information regarding legal events in the county and therefore, wouldnt result in unrelated business income. Rev. Rul. 82-139, 1982-2 CB 108. However, advertising revenue received by a bar association for ads place in its attorney directory are taxable income since the advertising is commercial in nature and represents an effort on the part of advertisers to maximize sales to a certain segment of the public. IRS Letter Ruling 9148054.

Similarly, magazine advertising revenues received by an exempt trucking association did not contribute to the associations exempt purposes where the advertising represented marketing efforts by the advertisers to sell their product. In this case, no systematic effort was made by the organization to advertise products related to the editorial content and no effort was made by the organization to limit advertisements to new products. florida Trucking Assn Inc. (1986) 87 TC 1039.

It is clear that, with a few exceptions, advertising revenues received by a 501(c)(3) exempt organization will often generate unrelated business taxable income (UBTI).

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How Do PID Controllers Work: Application & Theory

What is a PID controller?

A PID (Proportional Integral Derivative) controller is a common instrument used in industrial control applications. A PID controller can be used for regulation of speed, temperature, flow, pressure and other process variables. Field mounted PID controllers can be placed close to the sensor or the control regulation device and be monitored centrally using a SCADA system.

Example: Temperature control using a Digital PID controller

A typical PID temperature controller application could be to continuously vary a regulator which can alter a process temperature. This may be a pulsed switching device for electrical heaters or by opening and closing a gas valve. A heat only PID temperature controller uses a reverse output action, i.e. more power is applied when the temperature is below the setpoint and less power when above. PID control for injection and extrusion applications often employ additional cooling control outputs and usually require multiple controllers.

A PID controller (sometimes called a three term controller) reads the sensor signal, normally from a thermocouple or RTD, and converts the measurement to engineering units e.g. Degrees C. It then subtracts the measurement from a desired setpoint to determine an error.

The error is acted upon by the three (P, I & D) terms simultaneously:

PID controller Theory

The following section examines PID controller theory and provides further explanation of the question `how do PID controllers work'.

Proportional (Gain)

The error is multiplied by a negative (for reverse action) proportional constant P, and added to the current output. P represents the band over which a controller's output is proportional to the error of the system. E.g. for a heater, a controller with a proportional band of 10 deg C and a setpoint of 100 deg C would have an output of 100% up to 90 deg C, 50% at 95 Deg C and 10% at 99 deg C. If the temperature overshoots the setpoint value, the heating power would be cut back further. Proportional only control can provide a stable process temperature but there will always be an error between the required setpoint and the actual process temperature.

Integral (Reset)

The error is integrated (averaged) over a period of time, and then multiplied by a constant I, and added to the current control output. I represents the steady state error of the system and will remove setpoint / measured value errors. For many applications Proportional + Integral control will be satisfactory with good stability and at the desired setpoint.

Derivative (Rate)

The rate of change of the error is calculated with respect to time, multiplied by another constant D, and added to the output. The derivative term is used to determine a controller's response to a change or disturbance of the process temperature (e.g. opening an oven door). The larger the derivative term, the more rapidly the controller will respond to changes in the process value.

Tuning of PID controller Terms

The P, I and D terms need to be "tuned" to suit the dynamics of the process being controlled. Any of the terms described above can cause the process to be unstable, or very slow to control, if not correctly set. These days temperature control using digital PID controllers have automatic auto-tune functions. During the auto-tune period the PID controller controls the power to the process and measures the rate of change, overshoot and response time of the plant. This is often based on the Zeigler-Nichols method of calculating controller term values. Once the auto-tune period is completed the P, I & D values are stored and used by the PID controller.

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