As stated above, our design radiator here not only as necessary to give heat to the lavatory along an ice bath and then held as a result of these radiators towel warmers also work. These radiators helps to dry the towels and fast heating in the identical time of your towel warmer radiators for use after a shower, so it is relaxing and cozy enough for the cold kills more positive feel after taking a bath. It is also a downside normal when needed our towels to dry quickly, however, with the help of these radiators will be using dry towels and heat every after a bath. It is now December, and it definitely imposes the winter, the coldest season of the year where the days are shorter and nights longer. This season brings rain, snow, ice, fog, humidity, and more desire to stay home, next to the stove or heater. That's why from InformRisk we want to give some tips, provided by our client Jaen Weather, featuring all products and services to add warmth to our homes. The company Jaen Weather has a large variety of plumbing products, PVC pipes, air conditioning, swimming pools, water pumps, irrigation, exhaust gas pipes, fittings and many others that you discover in your facility. Today we will focus on products related to heating, since the essence in these months is to have the right home in the cold. One of the first councils to prevent the cold from seeping through the windows or doors is to review good insulation to avoid wasting heat that we provide our facilities, and avoid spending more energy than necessary. Another tip is to clean and check all the radiators, purging them to avoid loss of pressure, or if we have air heating, clean all vents with a brush for a smooth flow of it .. If your pocket allows us to make an investment, it is interesting to evaluate the option of installing a radiant floor heating. A system that distributes heat evenly, not dusty, and does not occupy space. It also prevents the installation of radiators where the smallest of the house may burn or give shots. The underfloor heating keeps the heat evenly in the bottom of the home, keeping your feet warm and cool head, avoiding headaches. The most important thing in every house, and regardless of the heating system we use, is to review the boiler by the service, ensure that it works properly and is in perfect condition. With these tips you can enjoy a warm and cozy winter .. Weather in Jaén we find a wide range of quality products related to heat the home. Its products highlight the best brands of boilers, underfloor heating, insulation, dry towels, radiators and heaters. Jaen Weather also has its own shuttle service for daily travel throughout the province distributing products wherever it is most convenient to their customers. This entry was posted in Clients IR.J, Facilities, Jaen Weather, Sectors and tagged Air Conditioning, Storage, Home Improvement, Heating, Quality, Customers, Trust, Building, Plumbing, Plumbing, Home, Professional Supplies, Pipes. Bookmark the permalink. A very good choice when it comes to heat the bathroom. A better option when our towel drying or heating. Furthermore, in design, has a very modern desentonará not with the environment. What are we talking about? From TowelClip, an original radiator Towel drying with paper clip, featuring the British firm Eskimo Designs. Thus, the product consumes only 45 watts, and its 80 inches wide, you can hang clothes to dry. A good choice right?. It is difficult to find common clock radios. Now every day is getting more and better functions and features. And .. What better time than summer to make that change you always wanted at home for the winter?, And if you are thinking the same thing .. Will one of those stories stairs disappears as you pass the peladaños? I confess I would have some fear to get on it .. hi I podrianmandar drawings as radiators are manufactured towel, as deve yevan oil being the electrical resistance and thermostat NEED TO as more electricity in order aorrar sketch drawings and maps that principle is based radiators, are sealed with vent hot oil, we would greatly appreciate thanks. Hello, I am very interested about this product. I am in Mexico City, and let me know the price, shipping and others. Thank you very much.
My fascination for astronomy comes from childhood, say the end of primary school. The two most memorable events (in the sense that they are the ones I produce a most vivid memory) are as follows. In one, my Dad (a doctor, and also interested in science) took me to the Centennial Park Observatory. There, a "master" ( The record Karnak is among the 10 e-books sold more police in the English Court since June, and has spent the entire month of October in the fifth. We all know the close relationship between African large herbivores such as rhinos, antelopes and cows, and oxpecker, those birds that land on his back and tear them parasites that lodge in your skin. It turns out that similar behavior has been documented recently in the sea between albatrosses and sunfish. And I say documented, because marine biologists have suspected since at least mid-twentieth century, something happened between these two species, but the few observations had always been frustrated by running away from the albatross. The albatross, which constitute the family of diomedeidos are the largest flying birds, can reach up to 3.5 meters from tip to wing tip. They are sea birds that inhabit the Indian and Pacific Oceans, and in the South Atlantic, and take advantage of winds to travel great distances. They feed on squid, fish and shellfish, and nest in colonies on remote islands. The ocean sunfish (Mola mola), meanwhile, is one of the largest bony fish in the world, can grow to three meters long and weigh two tons. It inhabits all warm and temperate seas of the world, and feeds primarily of small jellyfish. In June 2010, researchers aboard the ship Oshoro Maru of Hokkaido University were watching a bank of 57 sunfish in the North Pacific. The 57 fish were aligned and swam in the same direction, with the tip of the dorsal fin on the water surface. Almost all were infected by the copepod Pennella. Copepods are crustaceans that form part of the plankton, are usually small, but Pennella is the largest of them, and can measure up to 30 centimeters. The females, once mated, they become parasites of cetaceans and large fish, at this stage of his life head embedded in the skin of its host and dragged behind the body, a simple coat fleshy, legless or shell, to where they will releasing eggs. However, scientists realized that they were going sunfish to a Laysan albatross (Phoebastria immutabilis) and tried to get his attention aside swimming around. Soon, the albatross began to tear the skin parasites of fish and, soon after, other albatrosses, some of the same species, and other plovers (Phoebastria nigripes) joined the feast. A perfect example of mutualism, that kind of symbiosis in which win-win. In this case, the albatross get food and sunfish gets rid of parasites. By the way, as I mentioned at the beginning of the oxpecker not want to end without clarifying that they are not as good as they seem: In addition to eating parasites, with their beaks open wounds remain to feed on the blood of their hosts. And if this were not enough, they also eat boogers and earwax, and they pull their hair to line their nests. Mutualism is poised to become parasites. Always ends a living using every means at its disposal. Thus, over the millennia, a wormer may end up becoming a vampire, or carnivore. They shake hands and take the arm. There is a logic behind the obsession with bridal pearls You can use clear, clean colors and bright especially with a lot of white in them. His best are basic black and navy. Then the colors of a costume that sunny autumn day From gemstones century CE have been associated with the twelve signs of the Zodiac. In more modern times, these jewels have been used in birthstone moonstone bracelets is often given as a gift to celebrate the birthday of a loved one. The origins of the practice of the association of gems in particular with the zodiacal signs is thought to have its beginnings in the breastplate of Aaron, who was twelve precious stones, each associated with one of the twelve tribes of Israel, sewn into it. Each piece had the name of the tribe within it, and is sewn into the shell of four rows of three. While the names of the gems used are well known, the exact translation is indeterminate so the particular precious stones that were used are unknown. This has led to several gems that are associated with different signs of the zodiac. Later birthstones became associated with the months of the year instead of the signs of the zodiac and has been a good deal of variation in the month to which is assigned a gem. The list of the most widely used today is what was proposed by the Association of Jewelers of America in 1912, and has some substitutes for more expensive gemstones. A gemstone has been added since. Tanzanite was added as a birthstone for December 2002 by the American Gem, although it is recognized by all. Other schemes that associate with specific stones birth month birthstones and ayurvedic birthstones include mysticism. The mystical birthstones list data over 1000 years and originated Tibet, Ayurvedic system originated in ancient Indian philosophy and thought have originated about 1500 BC However most modern uses listings initiated by the Association of Jewelers. If you are buying birthstone jewelry as a gift there are a number of gems to choose from. If the modern August Peridot is not to your liking you can choose a carnelian of the traditional list of place. You can find beautiful birthstone rings, pendants, necklaces and even charms set with a tiny gem. They each make a wonderful gift that shows how much attention they have had to choose a perfect gift for someone special. Diamond earrings in an exclusive and elegant and make an impact in about a short time. Regarded as the best gift funny, are one of the first pieces of jewelry that are designed .. There are lots of different types of cuts and shapes of diamonds on the market today. One of the famous figures used in engagement rings and wedding rings is the first r .. If you think you're in love, and it's time to take your love one step further and then do it by gifting him or her engagement rings. rings have a special place in life .. Designer Jewelry is one fashion item that never goes out of style. However, the problem with the jewelry designer is that as soon as it becomes popular, the knock offs and replicas of ..
Recycled accessories are really collector's items. Most retailers will have the black and white diamond stud earrings that we present here, have a particular component given by the tips of the pens. A common pen ink is integrated, the screw tip, body and cap. Everything can be reused and recycled for various purposes. In this case we have recovered the metal tips to make earrings. Tools needed to make jewelry (tiny pliers) to better handle each piece. First a wire where it can place a ball or account. If the tip is not flat, can make a small circle with the wire to escape the puntilla.Luego not stop a few inches to hang and then do another little knot in the wire. Now put the tip with the wide end down so it looks like a bell. Now they must secure the party hang of our ears that can be rescued from some earring that has been unparalleled. And ready. We are a neighborhood trying to commune with nature in a more harmonious. We live and eat like you but we believe in reusing and recycling. We invite you to join the Eco Quarter and the experiences of your neighbors. Native Americans A black velvet dress that belonged to Whitney Houston and a pair of earrings she wore in "The Bodyguard" will be sold to the highest bidder next month. Auctioneer Darren Julien said Sunday that parts of Houston and other items were available shortly after the unexpected death of the singer on 11 February and to be included in a previously planned sale of Hollywood memorabilia that includes the staff Charlie Chaplin, Clark Gable jacket that used in "Gone with the Wind" and the staff of Charlton Heston in "The Ten Commandments." "It shows that these objects are an investment," said Julien. "You buy items such as buying shares. Buy at the right time and sell at the right time, and its value only increases." "It's a celebration of his life," said Julien. "You can not hide these things for fear of offending someone .. your life must be held. These objects are historical now died. They become part of history. Should be in museums. Had a life and career than anyone else has. " Articles in Houston "will always be collectible," he added. "For fans of Whitney Houston never had the chance to meet or talk to her, these items literally played most of his life. They are a way of relating to it or be part of your life without having known." The singer's gown is valued at $ 1,000 but will probably sell for more. Like a jacket he wore in "The Bodyguard", listed at $ 400, and artificial pearl earrings with minimum price of $ 600. The fans of Houston and other collectors may bid via the Internet, by phone or in person during the sale "Legends of Hollywood", from 31 March to 1 April. Many lots will be exhibited in a show open to the public from March 19 at the auction house Julien's Auctions in Beverly Hills, California, just blocks from the Beverly Hilton Hotel, where Houston died at age 48. Whitney Houston has just died a week, and already several of his belongings
Pregnancy is something that most females are difficult to deal with. Therefore, many solutions come to be created for making this experience much more bearable. 1 This evidence might include the The n pregnancy comfort pillow have become almost a necessity in recent years. They have become an important part of life Too few mothers and young mothers know the benefits of the cushion and maternity These natural pillows and duvets can be in the best hotels and stores worldwide. The peculiarity of these pillows is Homescapes No matter the stage of pregnancy you are, always good to have a maternity pillow. If you want to be comfortable and reconcile your sleep, nothing better than sleeping comfortably. Some say that the best way is to sleep on the left side with knees slightly bent to help increase the flow of oxygen to the baby, but it may be uncomfortable or difficult to maintain. So we will comment you on maternity pillows for comfort and quiet at night. You can get a pregnancy pillow maternity stores. But you have to locate where you feel pain and discomfort when sleeping, to know exactly what kind of pillow you need. Among the options available in maternity pillows are: full body foam (that fit all bodies), small pillows to relieve and prevent back problems or hip-specific, simple wedges that slide under your belly and pillows very tiny for support. If you can not differentiate one, get advice from the vendor in the maternity home that can offer one according to your needs. But it's not good to use these pillows when you're sore, it pays to be cautious and buy a small to start using so you will avoid future pain. The beauty of these pillows is that once you have your baby you can use to support your child and so will you pay more for spending your pillow, but still not good skimp on your comfort, as it will be months where annoying need to be comfortable. Someone who has not been pregnant will never understand the inconvenience that sometimes brings. Because the extra weight of your body is doing and how disproportionate it is located, the areas of the back, hips, legs and feet often feel incredible pain and discomfort. However, pregnancy pillows can be used to relieve pain and support the extra weight. Pregnancy pillows can be used for sleeping or during the day to provide extra comfort needed. Someone who has not been pregnant will never understand the inconvenience that sometimes brings. Because the extra weight of your body is doing and how disproportionate it is located, the areas of the back, hips, legs and feet often feel incredible pain and discomfort. However, pregnancy pillows can be used to relieve pain and support the extra weight. Pregnancy pillows can be used for sleeping or during the day to provide extra comfort needed. Basically, pregnancy pillows are specially designed to fit into certain parts of your body and add support. There are several different types made to fit on the lower back, between your knees or thighs, neck, or stomach. As you progress through the stages of pregnancy, it is harder to be comfortable. Is likely to reach the point of having trouble sleeping, because every way it was causes discomfort. As your belly gets bigger, sleeping on your back will make you feel like you can not breathe, and, of course, sleep on your stomach does not work. For these reasons, the more likely you will end up on your side. However, the extra weight makes your hips hurt and unable to reposition very well. Fortunately, pregnancy pillows provide relief!. The ideal position is to lie on your side with a pregnancy pillow between your knees / thighs and behind his back. The pillow between the legs provides support and relieves pressure on your hips, while the pillow behind his back allows you to rest a bit when you want to change position. This gives a range of motion and also gives back a break. Thus, you have the option of being at almost any angle to each side, instead of being restricted. Sitting for long periods of time also makes your joints hurt when you are pregnant. A pregnancy pillow behind your back will also help this, and prop your feet regularly. Some women find that putting a pillow on your lap to support the additional weight of their stomachs. These techniques can also be used when driving to prevent stiffness and discomfort. There are many models of pregnancy pillows available. Some are made of common pillow materials such as cotton or down, and other more expensive models are made of memory foam. Take your time and try different types to choose the most comfortable for you.
There is perhaps nothing more striking than a pair of gold earrings 18-carat yellow diamond ring. Typically, 18K yellow gold diamond earrings contain twenty small diamonds, all perfectly set along the rim. The most extravagant design and definitely more expensive features small diamonds, round along the inside and outside the ring. There are plenty of other designs, both online and otherwise. Visit your local jewelry store if it has the design you want above all else, you can browse online catalogs. Online shopping for earrings 18k yellow gold diamond ring is very convenient because all you have to do is go from one place to another, and you do not have to leave your seat to do so. Be prepared, though, the vast collection of styles every online store has to offer, so it may take you hours before you really can decide on the perfect pair. 18 carat yellow gold diamond earrings are a great thing to use at parties, especially if you are looking to draw attention to your face. To accentuate your beauty, take some simple but elegant, and keep your hair back. The brilliance of diamonds is so impressive it is impossible for anyone to miss it. If you already have a partner that will surely make you fall in love with you again. Similarly, if you are looking for someone to spend your life with, these earrings in 18K yellow gold diamond hoop attracts you. Very expensive at around $ 450, this particular pair of earrings is something that will be spent only on very special occasions. Use of this casual events make you look overdressed or dressed inappropriately. Perhaps some may even find that overwhelming. There are so many diamond and sapphire rings today. Clear, blue, yellow, pink, black, classic or contemporary? If you do not know what you are looking for can come off and end up paying more .. You need a watch that none of his friends who has achieved a number of proposes available on the market. You need your watch to be present throughout life or foresaw .. Yes, there are pearls of America. Recently, interest in pearl culture has grown around the world. There are about 300 species of molluscs can produce pearls native of .. When you are ready to sell a gold ring, you need to locate the best gold buyer. This will ensure you get the best price so you can have the best experience to sell a anill .. Fossil watches are relatively new in the market for well established brands. Fossil watches was created in 1984 and have not looked back since. These watches not only compete with the best m .. Forgive that many of the clothes are wrinkled, keep in mind that most of us have sent empaquetas bent and in the process and have shriveled. But everything is fixed with a good iron it? 
. And of course you can buy "our things", all crafts, all brand new, most made by us but some have been donated to support its great work Agus. Thanks to everyone who gave us stuff for the rake. Gradually increasing the goodies on offer and as you will see there are many to choose from!!!. Minimum order is 9.00 Diamond earrings are a classic end to any outfit. Available in a variety of metals, sizes and styles, are an accessory that is both easy to use and can coordinate well with other jewelry. Because of its versatility, are a popular choice for many women and girls today. The growing popularity of the hoop earring style combined with the value of diamonds, a couple of these extra revenue. Discover the design to go with can be a difficult decision. However, from a pair of diamond earrings are suitable for many different age groups, consider the size and style before buying something. For example, a younger users who want to opt for a smaller ring and diamonds so small that they are dominated by the fixture. Adolescents and young adults are likely to choose a medium-sized ring and sometimes choose to wear a smaller ring in the ear and a ring in the ear lobe. Adults are likely to choose the larger half of the ring. The thickness of metal (gold, platinum or silver) will vary by style. As used in the ears, a lighter metal such as 14k gold is the popular choice. When considering these for a gift, consider the recipient's age and design you like. The placement of the diamond may vary. Some diamond rings diamonds all the way around the rim, and some have diamonds set in the front. Modern designs include diamond earrings in the inner and outer surfaces of the ring. This style is particularly nice because you can see the bright diamond from different angles. Decide which type of setting you prefer. Options include: a set of channels and network. You can also choose between glitter hoop earrings diamond row, double row diamond earrings glamorous ring or diamond earrings triple hoop line. What are loose diamonds? They are diamonds that do not bind or adjusted to any piece of jewelry. The natural beauty and brightness of loose diamonds are excellent. diamond .. The diamond cross gold can cover a lot of bases. Can be a symbol of elegance of their faith. It may be a classic fashion statement. Can be given as a gift ever from Michelin .. When one thinks of jewelry usually associated with women and his desire to be beautiful and glamorous. From early childhood girls dream of being princesses and the use of tiaras, bracelets, .. Nothing is as fascinating as the world of gems and jewelry. But on the other side can also be very imminent. When buying and selling jewelry for any reason, is a collection o .. The clock, as a team of high-precision timing and jewelry art, use and proper maintenance is essential for long life, precision tracking and maintaining parts of aspects ..
Panasonic DMP-BDT210 designed with a normal glossy black front panel. To load a disc, the front panel opens, revealing the disc loading tray, some basic control buttons and a SD card slot and USB port. The front panel is closed after a disc is loading, the DMP-BDT210 giving a modern look and clean. However, if you are using a USB device, the front panel will remain open and are forced to look inside unattractive. A unique feature of the DMP-BDT210 is no touch sensor that opens the disc loading tray by moving the hand on the top of the player. This innovative feature could be a trick, but can be useful in a dark room or if your hands are full. AUDIO QUALITY: The DMP-BDT210 is capable of decoding and the final output bitstream audio format high resolution panasonic blu ray 3d player has finally made official offers several packages that are already in effect in the physical stores and online that will add Blu-ray 3D players, glasses and most notably, an exclusive copy of Avatar 3D Blu-ray (also available to existing owners via a mail in offer, owners of the Extended Edition collectors can preview a 3D Easter Egg there too.) Despite being the highest grossing 3D movie of all is not yet available in stores and there is unlikely to appear anytime soon, sending the price of packages clouds copies on eBay as owners of non-Panasonic 3D capable TVs try to get their hands on the final demo material. Many auctions are above the $ 200 mark, while the higher purchase price we saw was $ 399 about a week ago, while taking into account a copy of Bee Movie was for $ 400 back in the day, we can not say we are very surprised. Check out details on current promotions on its highly rated Panasonic HDTVs (and the demo tour that just started) in the press release after the break and bring your calculator, if Dancing with the Smurfs was his cup of tea anyway, we might have found the perfect way to finance your new home theater upgrade. Panasonic launches exclusive Avatar 3D Blu-ray pack-in, hard hit $ 400 on eBay originally appeared on Engadget on Wed, December 1, 2010 16:19:00 EDT. Please see our terms for use of feeds. Panasonic DMP-BDT210 designed with a normal glossy black front panel. To load a disc in the front panel opens, revealing the disc loading tray, some basic control buttons and a SD card slot and USB port. The front panel is closed after a disc is loading, which the DMP-BDT210 a clean and modern. However, if you are using a USB device, the front panel must be open and are forced to search the attractive interior. A unique feature of the DMP-BDT210 is free contact sensor that opens the disc loading tray by moving the hand on the top of the player. This innovative feature might be a trick, but can be very useful in a dark room or if your hands are full. AUDIO QUALITY: The DMP-BDT210 is capable of decoding and bitstream output of the latest high resolution audio formats Panasonic has always tried to make his players as environmentally friendly as possible. Reduce the size of their players is one thing that they have adopted and the DMP-BDT110 is a player very thin. The model has two buttons at the top for power and to open and close the disc tray. There is a front panel must be open to access other controls and ports. These are the standard Play / Stop buttons and a SD card slot and USB port. Of course, the front panel has to remain open when using a USB device. VIDEO QUALITY: HDMI video output and video connections are only for the DMP-BDT110. Missing component video outputs, but like most users to use the HDMI connection, this should not pose any problem. The HDMI connection will give you Full HD 1080p/24 video resolution standard and Blu-ray 3D. You can also at any standard DVDs to near HD resolution. The DMP-BDT110 is equipped with the new UniPhier chip, creating an impressive image quality. And the process of chromatic adaptation has improved the process of vertical color preference by 1.5 times, providing better images. Visual tests conducted by experts and users have been positive. AUDIO QUALITY: In addition to HDMI, the DMP-BDT110 has 2 analog output channels (red, white) and an optical digital output. It has support for DTS-HD Master Audio Essential and DTS-HD High Resolution Audio decoding for both domestic production and bitstream. Effects resulting in crisp sound quality and great surround sound. The starting time for the DMP-BDT110 is very fast, in seconds will be looking at the redesign of the homepage. If this is not fast enough for you, there is a configuration option to use the
Another product that has been selected to be on the Innovation Gallery V of this room for its development, efficiency and a way to control the temperature of each room with energy savings up to 30%. Also has a very modern design with a variety of colors that can be integrated from an elite dining to a nursery so we will explain the operation of air conditioning honeywell commercial thermostat evohome 2011 IFEMA. This thermostat is quick to install without requiring any cable slot or interference with the central heating system and operational management evohome is easy because you just have to keep on hand, sitting at the kitchen table or in the sofa and access to the single program as needed can also be operated intuitively and is easy to program using the touch screen so it is normal to have this in the lounge evohome manufacturer Honeywell in 2011 IFEMA.La Heating Air Conditioning and hot water may incur on average about 87 percent of total energy costs of housing. As the same warmth is not needed in each room all the time there is a huge energy saving potential in this way your house or apartment can be individually adapted to the daily rhythm of the family, avoiding unnecessary energy consumption. The controller features multi-zone Honeywell Innovation Gallery is equipped with a self-explanatory touch screen for easy use by tapping with the finger or a stylus. There is the possibility of wall mounting or tabletop use the RF model, and can configure up to eight zones with independent temperature programming schedule. The controller is part of the individual control system is provided so evohome of wireless RF (868 MHz). This control system can be used for underfloor heating, radiators, zone valves and mixing valves in residential and commercial option Control over the heat pump or boiler. Full marks to this innovative product such as Honeywell evohome Climatización 2011 IFEMA which can be found in the same room since we recommend visiting this site without fail as this one gets updated so as to help reduce CO2 emissions to the atmosphere. The feedback has a number of interesting and useful properties. For example enables accurate design systems from imprecise elements, stabilize an unstable system or minimize external shocks on a system. The following will make a trip on illustrative examples of the feedback to influence the achievement of milestones in control. The proliferation of control systems in everyday life mainly occurred from the mid-50's of last century. However, there are isolated examples occurred much earlier, such as ball or centrifugal governor (invented by English engineer J. 1788 Watt, as is also known as regulator Watt), which (see Figure 1.2) employs centrifugal force caused by the rotational speed of the balls of the counterweight by a shaft to slide the mechanism which drives the steam inlet valve. Note how the steam to be sealed to the machine it will decrease the rotational speed of the motor shaft, which will cause the balls to rotate more slowly and tend to fall. Then the cap which moves the shaft is pushed down to close the passage allowing steam to the machine, so that this will increase again its rotational speed. The centrifugal governor is a controller for the speed of rotation of the steam. Another example, though more modern than the previous one, is the end of the twentieth century is the thermostat used to regulate the temperature of a house, which was invented by Albert Butz in 1885 and commercial operation resulted in the company Honeywell. In Figure 1.3 (a) may be a Honeywell thermostat in 1953. In Figure 1.3 (b) shows an analog thermostat the most common that can still be seen in buildings. Its operation is based on the property of expanding metals present with increasing temperature. Placing a strip with two attached sheets of two metals with different expansion coefficient (copper and iron for example). When the temperature increases, the sheet expands more (in this case copper) curves as it needs more space, thereby separating the strip contacts and opens the electrical circuit. This stops the heating until the temperature drops, the metal shrinks, the strip is stretched and, therefore, closes the electrical circuit which activates the heater again. Regarding the concept of controller, the bi-metal strip acts as such and as a sensor, as from a set temperature set by the user using the command (curvature of the strip), the system compared to the control room ( output variable), when no difference is generated an error signal that is fed back to generate a control signal (control) to turn on or off the heating. Although the thermostat operation captures the essence of feedback control, the mechanism is too simple and imperfect (but useful), since there are delays between the sensor and the ground control (room). Current quality thermostats are anticipated or turning off the heating before the error signal changes its sign, thus avoiding large jumps in temperature as well as high operating cycles of the machine. This interaction between the dynamics of the process (the rate of heating or cooling the room) and the controller's operation is a key element in the design of current control systems. Over the twentieth century were developed control systems become more sophisticated, such as cruise control or speed control for vehicles. This was invented in 1945 by the blind inventor and mechanical engineer Ralph Teetor (see Figure 1.4). His idea was born from the frustration of going into the car with his lawyer, who slowed and accelerated steadily as he spoke. The first car with Teetor system was the Chrysler Imperial in 1958. This system calculated on the road speed rotations based on a bearing and a coil used for varying the throttle position as required. Today cars are perhaps the systems, being closer to the public, are having more control systems (adaptativo1 cruise control, control of tracción2, estabilidad3 control, emission control, etc..). Control is a mission critical production systems and electricity transmission, so that power plants are equipped with multiple control loops to ensure proper operation. The control is also essential in the transport of electricity, as it is to be carried to every corner where it is needed and adequate power, but power storage is very difficult, which must adapt as much as possible generation to consumption. The management of energy in the grid control is a problem easy to solve when a single generator and a consumer (as in an isolated house that generates its own electricity by photovoltaic panels for example), but it is a very complex highly distributed system where there are many generators, many more consumers and long distances between them. To add even more complexity to the problem of controlling the power grid, should be borne in mind that demand at a point or more at a time can change rapidly and unpredictably. Figure 1.5 shows an example of the power system (January 2009) high tension surrounding the city of Huelva. Red lines are drawn from 400 KV at the 220 KV green, blue those of 132/110 KV and in black, those of less than 110 KV. The broken lines, are the color they are, represent lines scheduled or building voltage corresponding to the color. The color black bullets represent electrical substations (next to the plants serve to increase tension before transporting, and next populations to reduce stress in order to use it), and squares represent plants with capacity MW production. The black-filled classic thermals, which are half filled with black wind and half filled with black diagonal combined cycle. The electrical control system required to adapt the production plants to the needs of customers (loads) through substations. Fallen trees on lines, wind, lightning, equipment failure, etc.., Can cause serious disturbances in the electrical system, therefore, must have sophisticated control systems that eliminate or minimize its impact on the end user. Depending on the seriousness of the disturbance different levels of the electrical control system will act to reduce the voltage dividing a network into subnetworks, disconnecting lines and users, and so on. The electrical system is thus a good example of how complicated it can be a control system. Figure 1.6 Original photograph of the first powered flight in history. At the controls Orville Wright, on the right, his brother Wilbur. December 17, 1903. The flight was on the beaches of Kitty Hawk, North Carolina. The apparatus, its first takeoff, ran 36 meters in 12 seconds. Achieving adequate control was probably the key that allowed the Wright brothers flying a machine in the early twentieth century (see Figure 1.6). In fact, the Wright brothers were not just famous for demonstrating powered flight, but to demonstrate the controlled powered flight. His first airplane incorporated and control surfaces (vertical fins and wings pato4) and adaptive wings that allowed the pilot to control flight. Actually, a plane in flight is a system that tends to become unstable, which requires a control system (the pilot when the flight is manual) to act consistently from falling. In this first controlled flight of 1903 has been followed 100 years of continued success in improving the control systems of aircraft, which have resulted in commercial and military apparatus of the present day (see Figure 1.7). In Figure 1.7 (a) shows the Eurofighter, a consortium born Anglo / German / Italian / Spanish. It is an extraordinary maneuverability aircraft (note the wings of ducks and truncated delta), which was designed to inherently unstable, a quad digital control system provides an artificial stability to be constantly adjusting the control surfaces (Fly-by- wire5). In Figure 1.7 (b) shows the X-45 UCAV (Unmanned Combat Air Vehicle), a U.S. unmanned military aircraft fit to fly to match 0.85 and capable of carrying missiles. Both total length and wingspan are around 11 meters. The space sector is one of the spearheads of development research in the field of control, the space race made both Russian and American technological milestones that have marked then have application to other fields. One of the great scientific challenges NASA faced since the mid 60's was to have a space shuttle. This got the April 12, 1981 with the launch of the first space shuttle system (in English: Space Transport System, or Space Shuttle STS), Columbia (see Figure 1.8 (a). Currently the use of the space shuttle is concentrated fully in the assembly of the International Space Station (in English: International Space Station, ISS). The lifetime of space shuttles in this class are expected to complete in late 2010. then must be replaced by the vehicle Orionnorteamericano and / or Russian spacecraft Kliper, much lower cost than American space shuttles. This section deserves a special place space probe Voyager I, which was launched on September 5, 1977 and because he has far exceeded their initial perspectives of life (it was designed initially to visit Jupiter and Saturn) is now the man-made object farthest from the Earth. In fact Heliopausa6 is going through more than 16,000 million kilometers from the sun exceeds When Voyager I The heliopause is the first manmade object to leave our star system. Then the scientists will get the first direct measurements of interstellar space conditions, which may provide clues relevant to the origin and nature of the universe. At this distance, signals Voyager I take more than fifteen hours to reach the control center on Earth. Voyager 1 has a parabolic trajectory, and has reached escape velocity, meaning that its orbit will never return to the inner solar system. That is, wander eternally sending signals through space to Earth until your system runs out of energy (about the year 2,025). The chemical industry is responsible for the considerable rise in the development of new materials, which is key in the development of our society. Furthermore, as the level of demand for it increases, it becomes increasingly necessary to improve the quality of products manufactured by minimizing all risks, such as environmental, which requires increasingly precise controls in this industria7. On the other hand, production processes are required to be increasingly energy efficient, which has led to cogeneración8 processes. Each new requirement adds complexity to the control system of the plant, creating in the process of designing a new challenge. Figure 1.9. shows the process known as Molecular Beam Epitaxy that allows precisely fabricate a few Angstroms (in a 10 million centimeter fit angstroms). This technique is used in the growth of semiconductor heterostructures by the crystalline perfection reached. molecular beams impinge on a substrate and various chemical reactions resulting in the deposition of successive monolayers. By proper control of the chemical species of the beams can vary the composition of epitaxial layers. The technical requirements are high because it requires perfect control of temperature and vacuum in the growth chamber. Because the sensor is a key element in control systems, new sensor development technologies are providing new opportunities in the development of drivers. Sensors with direct connection to computer (controller) backscattering9 laser application, video microscopy, infrared spectroscopy and Raman10, etc., are enabling processes so far are incorporating laboratory to the industrial world. The goal of engineering cybernetics, and established in the 40's and even before, has been to implement systems capable of exhibiting highly flexible or intelligent responses to changes in the situation. In fact, according to the RAE, cybernetics studies the similarities between the control and communication systems of living things and the machine, and in particular the application of biological regulatory mechanisms to technology. This is, cybernetics is completely linked to the control, and both disciplines have laid the foundations of modern robotics. Two important achievements in this area are the Mars Exploratory Rovers and entertainment robots like Sony's AIBO, which are shown in Figure 1.10. The Mars Exploratory Rovers have been developed by the Jet Propulsion Laboratory (JPL) and have been maneuvering on the surface of Mars for more than 4 years from January 2004, sending measurements and photos of your work environment. The AIB robot Sony released in 1999, was the first entertainment robot released in mass market. It is worth to mention his use of artificial intelligence techniques that allowed him to react to stimuli according to their own judgment. This high level of feedback is a key element in robotics, where issues such as avoiding obstacles, follow paths, learning or autonomy are very important . Despite the enormous progress in recent years occurred in the field of robotics, in many ways is still in its infancy. Robots today exhibit behaviors very simple compared to humans, and the ability to move, to interpret complex external signals, perform high-level reasoning and cooperate together as a team are very limited. No doubt the combination of artificial intelligence techniques (planning, adaptation and learning) to help control techniques to continuous improvement in the above fields. Figure 1.10 . robotic systems. (a) Spirit, one of the two Mars rovers that landed on him in January 2004. (b) Sony AIBO Robot, one of the first robots mass-marketed entertainment. Although the two robotic systems have very different roles, both make use of feedback between sensors, actuators and computer to work in unfamiliar environments. Control Network is a research area that covers many topics including congestion control, routing, copying data and energy management. Several features of these control problems make them very interesting. The dominant feature in all is the sheer scale of the systems to be controlled, the Internet is probably the biggest feedback control system that humanity has built ever. Another feature is the decentralized nature of the control problem: decisions must be made quickly and based only on local information. The stability of the Internet is very difficult due to variable time delays that occur, so that the information on the network can be viewed or sent to drivers only after a delay, so that the control action occurs on the network with considerable delay. uncertainties and variations in network topology changes, channel characteristics transmission, traffic demand and available resources are changing continuously and unpredictably. control networks is also intimately related to the control of the servers that are connected to them. Computers are the key elements of the routers, web servers and database servers used for communications, electronic commerce, advertising and information storage. While the costs of hardware (electronics) have declined substantially, the operation of these systems have increased, due to the difficulty in management and maintenance, due to the complexity increasingly accused. Figure 1.11 (a) shows an example of a multilayer system for e-commerce. The system has several layers of servers. header layer accepts incoming requests and routed to the http server, which distributes them to the application servers. Treatment of incoming requests can vary over a wide range, and application servers can also access other external servers managed by other organizations. control of an individual server in a layer is shown in Figure 1.11 (b). A number representing the quality of the service or the cost of the operation, such as response time, transfer rate, customer service or use memory-is measured on the computer. The control variables may represent incoming messages accepted priorities in the operating system or memory allocation. The feedback loop must then take care to keep the variables representing the quality of service within the range set of values. Figure 1.11. Example multilayer system for Internet services. (a) Users request information from a set of computers (layer 1), which in turn collects information from other computers (layers 2 and 3). (b) Each individual server has a set of benchmarks set by the operator (human) system. The feedback also allows the system to operate in the presence of uncertainties. The economy is a very large dynamic system with many actors: governments, , companies and individuals. Governments control the economy through laws and rates, central bank setting the interest rate and companies setting prices and making investments. individuals control the economy through purchases, savings and investments. enormous efforts have been made to model the system as both macro11 microeconómico12, but modeling is very complicated, because the system is strongly interrelated and, therefore, strongly influenced by the behavior within it of the different actors. JM Keynes in 1936 developed a model simple to understand relationships between gross national product, investment, consumption and government spending. One of the observations of Keynes was that under certain conditions, such as during the Great Depression of the 30's, an increase in public spending could lead to major increase in gross national product. This idea was used by several governments to alleviate the effects of the Great Depression. Keynes's ideas will be shaped in the next chapter. One of the reasons why it is very difficult to model economic systems is that they are not subject to conservation laws. A typical example is the market value of a company, which can change rapidly and erratically. Notwithstanding the above, yes there are specific areas of conservation laws that permit accurate modeling. A example is the product flow from one manufacturer to a retailer as illustrated in Figure 1.12. The products are natural numbers which obey a law of conservation, and the system can be modeled by considering the units of product in the different stocks. The control of production and consumption chains causes significant economic benefits by minimizing the amount of product stored. The real problems are more complex than shown in Figure 1.11, as there may be many different products, many factories and well distributed geographically they may require raw materials or intermediate products. Control of production and supply chains was proposed by JW Forrester in 1961 and is today of great importance as the economic benefits are obtained by minimizing inventories are considerable. Models for reduce inventories have been a huge boom thanks to the use of information technology and communications, which have allowed to predict sales, product tracking and adjust production accordingly just in time13. This control of production lines and supply has provided notable successes worldwide distributors (think for example in large supermarket chains, fast food, franchised boutiques, etc.). Internet advertising is an emerging application of control. Advertising on the Internet is an Emerging application of control. based advertising networks to measure the effects of different marketing strategies. consumer responses can be modeled, allowing feedback strategies. Figure 1.12. Dynamics of the supply chain. products are from manufacturer to customer through distributors and retailers as indicated by solid lines. Note the multiple feedback loops created by the broken lines, the limes are caused because each agent tries to maintain its own inventory level. The pharmaceutical industry has had a great development from the mid-twentieth century, when the drugs have started to arrive en masse to the general population, and access to them has become routine for citizens of developed countries. Today the pharmaceutical industry is facing great challenges to solve health problems that plague humanity: cancer, AIDS, heart disease, etc.. Therefore, investments in drug development are enormous and, accordingly, are also the complexity of the laboratories and techniques used. An example of this may be the biopharmaceutical industry, and within the industrial production of antibodies monoclonales14 (MAB), due to its diagnostic and clinical applications. This is an area that is currently in open defiance researcher and technology. concretize further the example, there are a number of complications that hinder célulahybridoma15 industrial production, so the current industrial control of the cell culture is performed manually. Complications arise for a control Automatic lie in such strict requirements that require the growth of crops, the lack of online measurements of substrates essential to the process, the lack of precise experimental data and the extremely complex dynamics of the process. In order to consider all process variables and their interaction on an industrial scale tend to integrate modeling, experimental design and validation, control and optimization in one system (see Figure 1.13) so as to increase productivity, regulate the quality product and reduce costs. The development of methodologies that permit rigorous model the behavior of complex natural systems (due to the interaction of many systems, most of the time very simple, but with intricate patterns of information flow) is an aspect sistemas16 dynamics. Advances that are occurring in science and technology are enabling a broader understanding conceive the behavior (dynamics) of complex systems that occur in nature. To give just some examples. biological systems. There an enormous interest in a reliable way to know the mechanisms that occur at the cellular level (see Figure 1.14 the particular case of the metaloproteínas17), not only because of using this knowledge to the medical to cure diseases, but, as we saw in the previous section to produce drugs, substances, cells, etc.., at industrial level. There are a variety of biological phenomena that provide an ample supply of examples of control, including gene regulation, hormonal feedback mechanisms, immunological and cardiovascular locomotor muscle control, active perception, vision and receiving information about the location of the body, its movements and the sensory system, attention and consciousness population dynamics and epidemics. Each of these (and many others) provide opportunities to explain what works, how it works and what can we do to affect its operation. Ecosystems. An ecosystem is a natural system that consists of a set of living organisms (biocenosis) and the physical environment in which they relate (biotope). An ecosystem is a unit composed of interdependent organisms which share the same habitat (see Figure 1.15). Ecosystems usually form a series of strings that show the interdependence of organisms within the system. Ecosystems are complex dynamic systems of multiple scales, which provide a new and wide range of challenges for modeling and analysis of feedback systems. Recent experience in the application of control techniques and modeling of dynamic systems to networks of bacteria, suggesting that much of the complexity of these networks is due to the presence multiple layers of feedback loops that provide robust functionality to the individual cell. However, in other cases, the events at the cellular level to benefit the colony at the expense of the individual. system-level analysis can be applied to ecosystems In order to understand the strength of these systems, and the extent to which decisions and events affecting individual species contribute to the strength and / or fragility of the ecosystem as a whole. Figure 1.15. Example of ecosystems. (a) Savannah (Tanzania). (b) coral reef in the Great Barrier Reef, the largest coral reef in the world, located in the Coral Sea, off the coast of Queensland in northeast Australia. Environmental Science. Environmental Sciences are an area of science whose main objective is to seek and understand the relationships that keeps the human being with himself and with nature. We know that human activities have altered the global environment. Researchers in this area face problems of enormous complexity, perhaps the first one is to understand the feedback systems that operate globally .. The environmental science involve a multidisciplinary study area encompasses different elements. includes the study of environmental problems and the proposed models for the sustainable development. For example, environmental sciences study the purification and water treatment (see Figure 1.16 (a)), ie the set of unit operations of physical, chemical or biological which aims at eliminating or reducing pollution or undesirable characteristics of water, whether natural, supply, process or waste-calls, in the case of urban sewage. The purpose of these operations is to get some water with the appropriate properties use to which they will give, so the combination and exact nature of the process varies depending on both the properties of water starting as their final destination. Another example of environmental sciences is the waste management . unusable waste is a problem for many companies, especially large cities, and for the whole population of the world due to overpopulation, human activities and modern consumerism have increased a lot the amount of waste generated (see Figure 1.16 (b)), this together with the inefficient management is done with the waste (open burning, landfill disposal in landfills or inefficient) causes problems such as pollution, which causes problems health and environmental damages deprovocar also social and political conflicts. Figure 1.16. Example fields of environmental science work. (a) purification plant and water treatment. (b) Solid waste classified home. 1) containers glass, 2) thin plastic, 3) thick plastic, 4) cardboard, 5) number, 6) cans packed, 7) paper, 
polystyrene, 9) scrap glass, 10) batteries, 11) different metals, 12) organic, 13) Tetra Pak, 14) cloth, 15) devices.
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