What Is a Magnetic Head?
What Is a Magnetic Head?

A magnetic head is any device used with some sort of recording technique designed to apply information to a type of physical medium such as a tape or hard disk. The concept uses electromagnetism to cause a certain material to change its orientation in a viable manner that can be interpreted by a playback resource. Traditionally, magnetic heads are used with some sort of tape coated in iron oxide. Disk drives use a similar principle, but convert the magnetism into electrical current.

For tape recorders, a type of magnetic head stays in place as the tape is run along its surface. Two designs are used for this process: a fixed or rotating head. Fixed heads are generally used for audio recording, magnetically adjusting two or more channels along the length of the tape. The rotating head is used for video technology, laying down magnetized data at an angle along the length of the tape to make use of the full surface area.

A tape-based magnetic head uses a basic structure to control the electromagnetic energy utilized to store data on the iron oxide. The magnetic material is designed in a round or square shape with a hole, allowing air or some other material to act as an insulator. As the tape passes along the magnetic head, the electromagnetic energy magnetizes the iron oxide on the tape. Utilizing a wire coil connected to the device, it can either be used as a magnetic head reader or magnetic recording head. This means that the tape can either be read for data or have data placed upon its length for storage.

Over the years, the magnetic head of hard disk technology has gone through many changes. During the early 1990s, metal-in-gap heads were invented that used a small piece of metal placed within the ferrite to help process more condensed pieces of information. In the early 2000s, heaters were added to the construction of hard disk to allow the magnetic heads to operate with additional disk platters. The heat generated from these devices helps saturate the disk with stronger magnetism, ensuring that the information is more securely stored. http://www.sunrise-group.net/

What Is a Magnetic Head?
What Is a Magnetic Head?

A magnetic head is any device used with some sort of recording technique designed to apply information to a type of physical medium such as a tape or hard disk. The concept uses electromagnetism to cause a certain material to change its orientation in a viable manner that can be interpreted by a playback resource. Traditionally, magnetic heads are used with some sort of tape coated in iron oxide. Disk drives use a similar principle, but convert the magnetism into electrical current.

For tape recorders, a type of magnetic head stays in place as the tape is run along its surface. Two designs are used for this process: a fixed or rotating head. Fixed heads are generally used for audio recording, magnetically adjusting two or more channels along the length of the tape. The rotating head is used for video technology, laying down magnetized data at an angle along the length of the tape to make use of the full surface area.

A tape-based magnetic head uses a basic structure to control the electromagnetic energy utilized to store data on the iron oxide. The magnetic material is designed in a round or square shape with a hole, allowing air or some other material to act as an insulator. As the tape passes along the magnetic head, the electromagnetic energy magnetizes the iron oxide on the tape. Utilizing a wire coil connected to the device, it can either be used as a magnetic head reader or magnetic recording head. This means that the tape can either be read for data or have data placed upon its length for storage.

Over the years, the magnetic head of hard disk technology has gone through many changes. During the early 1990s, metal-in-gap heads were invented that used a small piece of metal placed within the ferrite to help process more condensed pieces of information. In the early 2000s, heaters were added to the construction of hard disk to allow the magnetic heads to operate with additional disk platters. The heat generated from these devices helps saturate the disk with stronger magnetism, ensuring that the information is more securely stored. http://www.sunrise-group.net/

Strengthen Your Immune System With Luteolin
Strengthen Your Immune System With Luteolin

Luteolin is a powerful phytonutrient (a group of non-essential, plant based chemical compounds that have numerous health benefits in humans) that can boost your immune system and much more. In this article I will be discussing luteolin in greater detail and outlining how it benefits your body, the best food sources and the negative symptoms of consuming too much.

1) DISCOVERY:

Albert Szent-Gyorgyi was the first person to discover luteolin as part of the flavonoid family. He made the discovery in 1938 and initially named the flavonoids vitamin P as he thought they were a new vitamin. However, further research revealed that the flavonoids are not essential in humans and therefore not technically vitamins.

2) FUNCTION:

Luteolin has a variety of useful functions in the human body. It can help keep your body free from disease by boosting the immune system, preventing cancer, smoothing muscle contractions and strengthening the capillaries (the smallest blood vessels in the human body). Luteolin is also a powerful antioxidant (a substance which protects the body s cells from the harmful free radicals that are released during oxygen related reactions), antihistamine (a substance which reduces the effects of histamine and prevents allergic reactions such as itching and sneezing) and anti-inflammatory (a substance which prevents unnecessary inflammation within the body. Additionally, it acts as an effective treatment for diabetes (a condition where the blood glucose levels in your body become extremely high), respiratory disorders and vision disorders.

3) FOOD SOURCES:

Luteolin can be found in a wide range of plant based foods. Some of the richest sources of this flavone are artichokes (2.27 milligrams (mg) per 100 grams (g)), celery hearts (3.5mg per 100g), olive leaves (27.7mg per 100g), peppermint (11.33mg per 100g), pimento peppers (10.36mg per 100g), Queen Anne s Lace Leaves (34.1mg per 100g), sage (16.7mg per 100g) and thyme (45.25mg per 100g).

4) OVERDOSE SYMPTOMS:

Most people experience no negative symptoms when consuming high levels of luteolin. However, in rare instances eating high levels of this flavone can lead to gastric hypersecretion (excessive formation of gastric juices), nausea and vomiting.

5) LUTEOLIN SUMMARY:

Whilst luteolin does not receive nearly as much publicity as the more mainstream vitamins and minerals, it is still a very valuable nutrient. It acts in both a protective and supportive capacity within the human body and can also treat a number of unpleasant health conditions. So if luteolin is not currently part of your diet, make some changes and start eating more luteolin rich foods today. http://www.skyherb.cn/FeaturedproductsDetails_451.htm

What Is a Butterfly Valve Actuator?
What Is a Butterfly Valve Actuator?

A butterfly valve actuator is a remotely-operated device used to open and close butterfly type valves. These actuators are widely known as quarter-turn actuators since butterfly valves only require a quarter of a full rotation to fully open or close. They are typically rotary types and feature a range of power sources, with electric and hydraulic types being the most common. The actuation range of these devices is typically controlled by a set of limit switches that stop the butterfly valve actuator when the valve is fully cycled. They also generally include a over-torque protection device designed to stop the actuator if the valve is obstructed.

Many butterfly valves are manually operated using a straight handle or geared control wheel. Where the valves require large amounts of torque to operate, are in inaccessible locations, or are in environments hazardous to an operator, a butterfly valve actuator may be used to facilitate remote operation. These devices make use of an electric motor or a source of compressed hydraulic oil to turn an output shaft connected to the valve stem. Generally, hydraulic actuators are used in applications such as high pressure oil and gas lines where the actuation torque is very high. In these applications, the butterfly valve actuator may also utilize a feed of high-pressure gas bled directly from the pipeline for actuation.

The range of motion that the butterfly valve actuator generates at each cycle is usually controlled by a set of limit switches, one each for the valve s open and closed positions. These switches will signal the actuator controller to stop when the valve opens or closes fully. The control loop will typically also feature some sort of protection device designed to stop the actuator should the valve jam or become obstructed. These switches and limits prevent the actuator from over-cycling and damaging itself or the valve. http://www.hoxho.com/

Rose Tea Light In Glass Candle Holder Wedding Souvenirs
Rose Tea Light In Glass Candle Holder Wedding Souvenirs

If you are making arrangements for the wedding favor and are searching for the gifts that you may use to gift those who attend the ceremony, then don t worry, there are a number of options out of which you may choose the right one. Wedding favor is a way of showing the happiness and the goodness of the wedding ceremony. It is just a way to thank those who have come and joined you in the ceremony and shared the good time with you. Hence it is very important to show a good response and show them your gratitude.

For doing so you can opt for the gifts that are both economical as well as elegant. One product that you would really love to gift to those who are attending the wedding ceremony is the Rose tea light in glass candle holder.

Candle holders are the products that are in demand these days. The elegance and the purity of the light from candle make them perfect to be a part of any ceremony or function. To add to the fire you can select an elegant candle holder that would obviously attract the attention of those visiting your place. The Rose tea light in glass candle holder is an ideal gift in this condition. This is a very beautifully designed glass candle holder that is specifically meant for gifts and for wedding favors.

You can get these candle holders at a very less price when compared to the other gift options. This product in particular is totally a class apart from the normal candle holder. Firstly this candle holder is prepared from the frosted glass that makes it really beautiful and attractive. Rose tea light in glass candle holder is in great demand and is one of the favorite gift items of this season.

You can also use a scented candle so as to provide a smooth and rich outlook to it. This is one of the best selling candle holders that have ever been launched in the market. If you are planning to shop for wedding favors, then this certainly is the thing you should grab before the stock empties. http://www.candleholder-vase.com/

Workpiece clamping devices in forging manipulators
Workpiece clamping devices in forging manipulators

A forging manipulator has two pairs of workpiece gripping arms which operate in respective mutually perpendicular planes. Each pair of arms is operable by a respective independent actuating mechanism, so that the respective pairs of arms can accommodate workpiece dimensions. The two actuating mechanisms comprise: a common bore in the gripper carrier of the manipulator, defining two co-axial fluid pressure cylinder disposed end to end, a respective annular piston in each of these cylinders, a respective hollow piston rod extending from each piston towards the gripper arms, one of these piston rods extending within the other piston rod, and a respective wedge at the forward end of each piston rod, for operating the corresponding pair of gripper arms on movement of the piston rod. The wedges slope in opposite directions, and the pistons move simultaneously in opposite directions. This provides a very compact construction and allows material and tools to be delivered to and removed from the manipulator from the rear through the hollow piston rod.

A first hollow piston rod connected to said first piston and extending longitudinally towards said gripper arms;

A first wedge means connected to said first piston rod for longitudinal sliding thereby and coupled to said first pair of gripper arms for opening and closing said first gripper arms on longitudinal sliding of said first wedge means; a second longitudinal annular cylinder in said gripper carrier between said first cylinder and said gripper arms;

A second annular piston slidable in said second cylinder;

a second hollow piston rod connected to said second piston and extending longitudinally towards said gripper arms, said first piston rod extending slidably through said second piston and second piston rod;

Second wedge means connected to said second piston rod for longitudinal sliding thereby and coupled to said second pair of gripper arms for opening and closing said second gripper arms on longitudinal sliding of said second wedge means;

And means for pressuring said first and second cylinders for moving said first and second pistons simultaneously in respective opposite directions;

Said first wedge means and second wedge means having respective angled operative surfaces for acting on said first and second gripper arms which surfaces of said first wedge means are angled oppositely to said surfaces of said second wedge means. http://www.cntyjx.net/gsjs_en.asp

PT6 Fuel Nozzle Maintenance

PT6 Fuel Nozzle Maintenance

By Peter Boissonneault

The Pratt & Whitney PT6 engine has proven itself to be one of most reliable and cost-efficient engines ever developed. Operators, and those of us in the repair and overhaul business, have become keenly aware that the ever-reliable PT6 is not immune to increasing maintenance costs. The challenge of maintaining high levels of quality while holding the line on costs is always present. Maintenance and repair organizations which are capable of meeting the ever-increasing quality demands of its customers, and at the same time controlling costs, will surely be in demand.

This article will address one aspect of hot section maintenance, those dealing with fuel nozzles and their proper servicing.

Design and installation

The fuel nozzle design and installation in the PT6 engine is simple and efficient. The installation consists of 14 adapter assemblies consisting of, primary, secondary, and inlet adapters of either simplex or duplex design. Unfortunately there exists some misunderstanding regarding the ongoing maintenance, recertification, and required overhaul of the fuel nozzles. We will make every effort to clear up some of the confusion on this topic and outline some of the choices available to you.

The Pratt & Whitney maintenance manual addresses recommended and approved Fuel nozzle servicing procedures. The manual outlines recommended time intervals, inspection tasks, fits and clearances, cleaning procedures, leak testing, and flow checks.

Time intervals between fuel nozzle servicing should initially follow the Pratt & Whitney maintenance manual recommendations. Once an operator gains a history or trend on the condition of their fuel nozzles, adjustments such as time extensions or contractions might be warranted. http://www.datianmachine.com/

Surge arrester
Surge arrester
A protective device designed primarily for connection between a conductor of an electrical system and ground to limit the magnitude of transient overvoltages on equipment. A lightning arrester is really a voltage-Surge arrester.

The valve arrester consists of disks of zinc oxide material that exhibit low resistance at high voltage and high resistance at low voltage. By selecting an appropriate configuration of disk material, the arrester will conduct a low current of a few milliamperes at normal system voltage. During conditions of lightning or switching surge overvoltages, the surge current is limited by the circuit; and for the magnitudes of current that can be delivered to the arrester location, the resulting voltage will be limited to controlled values, and to safe levels as well, when insulation levels of equipment are coordinated with the surge arrester protective characteristics.

A typical surge arrester consists of disks of zinc oxide material sized in cross-sectional area to provide desired energy discharge capability, and in axial length proportional to the voltage capability. The disks are then placed in porcelain enclosures to provide physical support and heat removal, and sealed for isolation from contamination in the electrical environment. See Lightning and surge protection

Surge arresters are an essential aid to insulation coordination in electrical power supply systems. Valuable equipment can be protected against lightning- and switching overvoltages.
http://www.pomanique.com/productslist/surge-arrester/23/1.htmlSurge arrestersurge arrestersSurge arrester

Bucket Tooth Pin Hitachi Bucket Teeth Pin
Bucket Tooth Pin Hitachi Bucket Teeth Pin
Ningbo Fancheng Machinery Parts Manufacturer (briefly named as Fancheng Company), located in the Bucket Tooth Pin scenic Hengxi industrial area, is specialized in producing all kinds of bucket teeth, bucket teeth pin, die castings etc. Especially bucket teeth pin, which is the leading product of the company.
　By applying advanced technology and scientific management , Fancheng Company has now the ability of producing and testing the Bucket Tooth Pin whole manufacturing process , from forging、machining to heat treatment, etc. , which enables its products with exquisite workmanship , superior performance and in stable quality. Fancheng Company has enjoyed high reputation in its business field, and has been recognized in Europe , America and many other countries in the world because of its good-quality and reasonable price . Meanwhile, Fancheng company has already developed a good long-term relationship with many manufacturers and wholesalers throughout the world.
　Fancheng company will continue adhering to its service principle of “ Quality first, credit first , customer first“ , and sincerely welcome friends home and abroad to visit and establish business relationship with him.
http://www.toothparts.com/

RMT-ブレイブソング-RMT-BSO-RMT
RMT-ブレイブソング-RMT-BSO-RMT

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