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Free Space Optics Essay ABSTRACT: FSO may sound new and experimental but in fact it predates optical fiber and has its roots in wartime efforts to develop secure communication systems that did not require cable and could withstand radio jamming. FSO has been around for more than a decade, but it is only recently that interest in this technology has started to grow. Free Space Optics (FSO) communications, also called Free Space Photonics (FSP) or Optical Wireless, refers to the transmission of modulated visible or infrared (IR) beams through the atmosphere to obtain optical communications. Like fiber, Free Space Optics (FSO) uses lasers to transmit data, but instead of enclosing the data stream in a glass fiber, it is transmitted through the air. Free Space Optics (FSO) works on the same basic principle as Infrared television remote controls, wireless keyboards or wireless Palm ® devices. How Free Space Optics (FSO) Works Free Space Optics (FSO) transmits invisible, eye-safe light beams from one telescope to another using low power infrared laser in the terahertz spectrum. The beams of light in Free Space Optics (FSO) systems are transmitted by laser light focused on highly sensitive photon detector receivers. These receivers are telescopic lenses able to collect the photon stream and transmit digital data containing a mix of Internet messages, video images, radio signals or computer files. Commercially available systems offer capacities in the range of 100 Mbps to 2.5 Gbps, and demonstration systems report data rates as high as 160 Gbps. Free Space Optics (FSO) systems can function over distances of several kilometers. As long as there is a clear line of sight between the source and the destination, and enough transmitter power, Free Space Optics (FSO) communication is possible. [pic] Free Space optics (fso) technology Lasers are one of the most significant inventions of the 20th century they can be found in many modern products, from CD players to fiber-optic networks. A laser generates light, either visible or infrared, through a process known as stimulated emission. To understand stimulated emission, understanding two basic concepts is necessary. The first is absorption which occurs when an atom absorbs energy or photons. The second is emission which occurs when an atom emits photons. Emission occurs when an atom is in an excited or high energy state and returns to a stable or ground state – when this occurs naturally it is called spontaneous emission because no outside trigger is required. Stimulated emission occurs when an already excited atom is bombarded by yet another photon causing it to release that photon along with the photon which previously excited it. Photons are particles, or more properly quanta, of light and a light beam is made up of what can be thought of as a stream of photons. [pic] A basic laser uses a mirrored chamber or cavity to reflect light waves so they reinforce each other. An excitable substance – gas, liquid, or solid like the original ruby laser – is contained within the cavity and determines the wavelength of the resulting laser beam. Through a process called pumping, energy is introduced to the cavity exciting the atoms within and causing a population inversion. A population inversion is when there are more excited atoms than grounded atoms which then leads to stimulated emission. The released photons oscillate back and forth between the mirrors of the cavity, building energy and causing other atoms to release more photons. One of the mirrors allows some of the released photons to escape the cavity resulting in a laser beam emitting from one end of the cavity. Terrestrial Laser CommunicatIOns Challenges FogFog substantially attenuates visible radiation, and it has a similar affect on the near-infrared wavelengths that are employed in laser communications. Similar to the case of rain attenuation with RF wireless, fog attenuation is not a â€Å"show-stopper† for optical wireless, because the optical link can be engineered such that, for a large fraction of the time, an acceptable power will be received even in the presence of heavy fog. Laser communication systems can be enhanced to yield even greater availabilities by combining them with RF systems. Physical Obstructions Laser communications systems that employ multiple, spatially diverse transmitters and large receive optics will eliminate interference concerns from objects such as birds. Pointing Stability Pointing stability in commercial laser communications systems is achieved by one of two methods. The simpler, less costly method is to widen the beam divergence so that if either end of the link moves the receiver will still be within the beam. The second method is to employ a beam tracking system. While more costly, such systems allow for a tighter beam to be transmitted allowing for higher security and longer distance transmissions. Scintillation Performance of many laser communications systems is adversely affected by scintillation on bright sunny days. Through a large aperture receiver, widely spaced transmitters, finely tuned receive filtering, and automatic gain control, downtime due to scintillation can be avoided. FSO: Wireless, at the Speed of Light Unlike radio and microwave systems, Free Space Optics (FSO) is an optical technology and no spectrum licensing or frequency coordination with other users is required, interference from or to other systems or equipment is not a concern, and the point-to-point laser signal is extremely difficult to intercept, and therefore secure. Data rates comparable to optical fiber transmission can be carried by Free Space Optics (FSO) systems with very low error rates, while the extremely narrow laser beam widths ensure that there is almost no practical limit to the number of separate Free Space Optics (FSO) links that can be installed in a given location. How Free Space Optics (FSO) can help? FSO’s freedom from licensing and regulation translates into ease, speed and low cost of deployment. Since Free Space Optics (FSO) transceivers can transmit and receive through windows, it is possible to mount Free Space Optics (FSO) systems inside buildings, reducing the need to compete for roof space, simplifying wiring and cabling, and permitting Free Space Optics (FSO) equipment to operate in a very favorable environment. The only essential requirement for Free Space Optics (FSO) or optical wireless transmission is line of sight between the two ends of the link. For Metro Area Network (MAN) providers the last mile or even feet can be the most daunting. Free Space Optics (FSO) networks can close this gap and allow new customer’s access to high-speed MAN’s. Providers also can take advantage of the reduced risk of installing an Free Space Optics (FSO) network which can later be redeployed. The Market. Why FSO? Breaking the Bandwidth Bottleneck Why FSO? The global telecommunications network has seen massive expansion over the last few years. First came the tremendous growth of the optical fiber long-haul, wide-area network (WAN), followed by a more recent emphasis on metropolitan area networks (MANs). Meanwhile, local area networks (LANs) and gigabit ethernet ports are being deployed with a comparable growth rate. In order for this tremendous network capacity to be exploited, and for the users to be able to utilize the broad array of new services becoming available, network designers must provide a flexible and cost-effective means for the users to access the telecommunications network. Presently, however, most local loop network connections are limited to 1.5 Mbps (a T1 line). As a consequence, there is a strong need for a high-bandwidth bridge (the â€Å"last mile† or â€Å"first mile†) between the LANs and the MANs or WANs. A recent New York Times article reported that more than 100 million miles of optical fiber was laid around the world in the last two years, as carriers reacted to the Internet phenomenon and end users’ insatiable demand for bandwidth. The sheer scale of connecting whole communities, cities and regions to that fiber optic cable or â€Å"backbone† is something not many players understood well. Despite the huge investment in trenching and optical cable, most of the fiber remains unlit, 80 to 90% of office, commercial and industrial buildings are not connected to fiber, and transport prices are dropping dramatically. Free Space Optics (FSO) systems represent one of the most promising approaches for addressing the emerging broadband access market and its â€Å"last mile† bottleneck. Free Space Optics (FSO) systems offer many features, principal among them being low start-up and operational costs, rapid deployment, and high fiber-like bandwidths due to the optical nature of the technology. Broadband Bandwidth Alternatives Access technologies in general use today include telco-provisioned copper wire, wireless Internet access, broadband RF/microwave, coaxial cable and direct optical fiber connections (fiber to the building; fiber to the home). Telco/PTT telephone networks are still trapped in the old Time Division Multiplex (TDM) based network infrastructure that rations bandwidth to the customer in increments of 1.5 Mbps (T-1) or 2.024 Mbps (E-1). DSL penetration rates have been throttled by slow deployment and the pricing strategies of the PTTs. Cable modem access has had more success in residential markets, but suffers from security and capacity problems, and is generally conditional on the user subscribing to a package of cable TV channels. Wireless Internet access is still slow, and the tiny screen renders it of little appeal for web browsing. Broadband RF/microwave systems have severe limitations and are losing favor. The radio spectrum is a scarce and expensive licensed commodity, sold or leased to the highest bidder, or on a first-come first-served basis, and all too often, simply unavailable due to congestion. As building owners have realized the value of their roof space, the price of roof rights has risen sharply. Furthermore, radio equipment is not inexpensive, the maximum data rates achievable with RF systems are low compared to optical fiber, and communications channels are insecure and subject to interference from and to other systems (a major constraint on the use of radio systems). Advantages A free space optical (FSO) system offers a flexible networking solution that delivers on the promise of broadband. Only free space optics or Free Space Optics (FSO) provides the essential combination of qualities required to bring the traffic to the optical fiber backbone – virtually unlimited bandwidth, low cost, ease and speed of deployment. Freedom from licensing and regulation translates into ease, speed and low cost of deployment. Since Free Space Optics (FSO) optical wireless transceivers can transmit and receive through windows, it is possible to mount Free Space Optics (FSO) systems inside buildings, reducing the need to compete for roof space, simplifying wiring and cabling, and permitting the equipment to operate in a very favorable environment. The only essential for Free Space Optics (FSO) is line of sight between the two ends of the link. âž ¢ Freedom from licensing and regulation leads to ease, speed and low cost of deployment. âž ¢ Since FSO units can receive and transmit through windows it reduces the need to compete for roof space, simplifying wiring and cabling. âž ¢ Only need is the line of sight between the two ends of the link. âž ¢ Providers take advantage of the reduced risk in installing FSO equipment, which can even be re-deployed. âž ¢ Zero chances of network failure. âž ¢ Virtually unlimited bandwidth. APPLICATIONS âž ¢ Metro network extensions – FSO is used to extend existing metropolitan area fiberings to connect new networks from outside. âž ¢ Last mile access – FSO can be used in high-speed links to connect end users with ISPs. âž ¢ Enterprise connectivity The ease in which FSO can be installed makes them a solution for interconnecting LAN segments, housed in buildings separated by public streets. âž ¢ Fiber backup FSO may be deployed in redundant links to backup fiber in place of a second fiber link. âž ¢ Backhaul – Used to carry cellular telephone traffic from antenna towers back to facilities into the public switched telephone networks. Free Space Optics (FSO) Challenges The advantages of free space optical wireless or Free Space Optics (FSO) do not come without some cost. When light is transmitted through optical fiber, transmission integrity is quite predictable – barring unforeseen events such as backhoes or animal interference. When light is transmitted through the air, as with Free Space Optics (FSO) optical wireless systems, it must contend with a complex and not always quantifiable subject the atmosphere. âž ¢ Fog and free space optics (fso) âž ¢ Physical obstructions and free space optics (fso) âž ¢ Free space optics (fso) pointing stability – building sway, tower movemen t âž ¢ Scintillation and free space optics (fso) âž ¢ Solar interference and free space optics CONCLUSION FSO enables optical transmission of voice video and data through air at very high rates. It has key roles to play as primary access medium and backup technology. Driven by the need for high speed local loop connectivity and the cost and the difficulties of deploying fiber, the interest in FSO has certainly picked up dramatically among service providers worldwide. Instead of fiber coaxial systems, fiber laser systems may turn out to be the best way to deliver high data rates to your home. FSO continues to accelerate the vision of all optical networks cost effectively, reliably and quickly with freedom and flexibility of deployment. REFERENCES 1)http://en.wikipedia.org/wiki/Free-space_optical_communication 2)http://www.freespaceoptics.org/freespaceoptics/default.cfm 3) http://www.freespaceoptic.com/

Water Pollution Essay Example for Free

Water Pollution Essay One of the major issues that are of great concern in my town is how toxic heavy metals have been deposited into flowing waters. Toxic heavy metals in water, is as a result of untreated pollute deposited into lakes, streams, rivers, by manufacturing industries which in turn is consumed by domestic users. The effluent from such industry is deposited into water bodies or could be washed away from the top soils by flood into drainages which is emptied into such water bodies. The presence of these undesirable elements in foods (fish) is due to the ingestion of water containing industrial and domestic influent. Most of these heavy metals are deposited in the liver of certain vertebrates and fatty tissues of fishes. The amount of each of these elements present in the fish depends on such variables as the amount present in the food chain, size and age of the fishes. Most of these heavy metals (which include Lead, Cadmium, Copper, Zinc e. t. c) are toxic and hazardous to man depending on their concentration in food. Conclusion From my findings, I will recommend that waste from these manufacturing Industries be treated properly, recycled and be properly disposed. Reference D. G. Rickard and M. E. R Dully (1983) Environmental Pollution: Beries. B

Markets Segmentation And Market Mix Of Easyjet Marketing Essay

Markets Segmentation And Market Mix Of Easyjet Marketing Essay Introduction Easyjet is a successful example of a European no-frills airline. Founded by the Cypriot Stelios Haji-Iaonnou in 1995, Eayjet gained a dominant market position over time thanks to its excellent marketing strategies. How Easyjet has segmented its market for its major product and what is the marketing mix? Which parts of the marketing mix are done efficiently and which parts need some improvements Markets segmentation and marketing mix of Easyjet Easyjets market segmentation Low-cost airlines like Easyjet, have picked up some customers from their traditional competitors like BA (British Airways) or Air France, but have specially created a large traffic of induction (creating a new market). Easyjet operates in a different way to Ryan Air its direct competitor in the market, which is targeting the leisure traveller for whom the ticket price is important. Easyjet has the same type of clientele for whom the ticket price was slightly less important and also business customers whose companies seek to save on transportation costs, but care about the travels conditions. So Easyjet has two different kind of customers who are leisure customers and the business customers. 1.2 Easyjets marketing mix Any business that does not have a concerted marketed strategy is setting itself up to fail. So what is the Easyjets marketing mix in term of product, place, price and promotion? Product Product is the most important component in an organization. Without a product there is no place, no price, no promotion, and no business. Product is anything that can be offered to a market to satisfy a want or a need. It is the core ingredient of the marketing mix and is everything favourable and unfavourable, tangible and intangible received in the exchange of an idea, service or good (Kotler 11th edition, 2003). Easyjet is a business offering service products, flights across destinations, in the transportation industry. Easyjet operates over 500 routes and has 182 aircrafts in 28 countries (www.easyjet.com). Easy-Jet positions itself as low-cost airlines or better as cutting costs airlines. Its product strategy stops to the actual product without concern about the augmented product. They dont offer service at all but just the ticket. For example Easy-Jets product strategy ends at the expected level of five-product levels. There is no augmented product. There is no business seat on flights (Easyjet offer a mono class of seat but does not offer last minute deals), no executive lounge at airports, no free food and drinks on flights, no entertainment on flights, and in most cases Easy-Jet flies from major airports. Place Easyjet targets customers looking to minimise their transportation costs, or any type of customer looking for a low price. In general Easyjets customer is a customer who started to prefer the plane to land transportation to browse for short distances between different cities served. So Easyjet is competing as well with the airlines as the land transports price Price is the value placed on what is exchanged during the marketing process. The customer exchanges his/her money or donation in return for a satisfaction or utility (S. Dibb and L. Simkin 2001). Easyjet has always had a one-way ticketing policy. The airline has only one price in the market for any one flight at any one time. The lowest fare is offered into the market first and then prices rise as the departure draws closer and the seats are sold. This ticketing philosophy is transparent to consumers. There is a value for money offering, which is easily understood by consumers. By offering only one price in the market, the consumer is confident that shopping around using other channels or making greater ticketing restrictions will not reap the reward of lower fares. As the airline educates their consumers that the cheapest fares are sold first, consumers checking prices are more likely to purchase straightaway as they will have confidence that lower prices are not likely to appear later. The airline only sells tickets on a one-way basis and therefore if a passenger wants a return ticket they must buy two one-way tickets. The advantage of this for passengers is that they can b ook short stay trips without having to pay flexible return ticket prices. For business travellers the availability of flexible tickets is usually considered important. If a business meeting runs over the traveller needs to be able to change their ticket and take a later flight. This depends on two things. Firstly the ability to change the ticket, and secondly the availability of a later flight to change on to. Easyjet has been targeting business travellers and therefore they have addressed these issues by increasing the number of daily flights to key business destinations and by introducing a method of changing tickets. For a fee of  £10 Easyjet passengers can change their ticket to a different flight as long as there is an available seat on the desired flight To reflect the current market price, the traveller will have to pay the difference between the price they originally paid for the ticket and the current price for a seat on the required flight. The airline can then release t he seat no longer required on the original flight and sell this seat again. promotion The distribution policy of Easyjet shows a high use of direct sales from call centre and internet outside traditional distribution channels. 95% of the seats are sold online (www.easyjet.com). They use electronic ticket, reducing cost of ticketing procedures and remove two Kinds of costs: -commission for travel agencies -transaction related to reservation systems What part of the marketing need to be improved? Easyjet is one of the most successful of the new economy carriers in Europe. So they have a strong marketing strategies and it is going to be a little bite difficult to change this strategy but it can always been improved. Product Easyjet could benefit from randomly offering last-minute deal under its single pricing strategy. By occasionally lowering ticket prices to bump up revenue on some unbooked-flights, Easyjet could create the expectation that such bargains would be available on a predictable basis. Easyjet could create another brand having different mission and different market target and offering an augmented product such a better quality at a low price as Delta Airlines did with Song. Promotion The use of the internet ticketing is dangerous in case of dysfunction of the server because of infection by viruses or any other kind of software problem. It is undeniable that this system reduces cost but it can cause problem if the general is touched by problem. Conclusion If the other marketing strategies enable the company to evaluate everything about the business, only the marketing mix

Thomas Paine :: essays research papers

Library: Historical Documents: Thomas Paine: Rights Of Man: Part The First -------------------------------------------------------------------------------- Order The Rights of Man now. Part The First Being An Answer To Mr. Burke's Attack On The French Revolution -------------------------------------------------------------------------------- George Washington PRESIDENT OF THE UNITED STATES OF AMERICA SIR, I present you a small treatise in defence of those principles of freedom which your exemplary virtue hath so eminently contributed to establish. That the Rights of Man may become as universal as your benevolence can wish, and that you may enjoy the happiness of seeing the New World regenerate the Old, is the prayer of SIR, Your much obliged, and Obedient humble Servant, THOMAS PAINE -------------------------------------------------------------------------------- The Author's Preface to the English Edition From the part Mr. Burke took in the American Revolution, it was natural that I should consider him a friend to mankind; and as our acquaintance commenced on that ground, it would have been more agreeable to me to have had cause to continue in that opinion than to change it. At the time Mr. Burke made his violent speech last winter in the English Parliament against the French Revolution and the National Assembly, I was in Paris, and had written to him but a short time before to inform him how prosperously matters were going on. Soon after this I saw his advertisement of the Pamphlet he intended to publish: As the attack was to be made in a language but little studied, and less understood in France, and as everything suffers by translation, I promised some of the friends of the Revolution in that country that whenever Mr. Burke's Pamphlet came forth, I would answer it. This appeared to me the more necessary to be done, when I saw the flagrant misrepresentations which Mr. Burke's Pamphlet contains; and that while it is an outrageous abuse on the French Revolution, and the principles of Liberty, it is an imposition on the rest of the world. I am the more astonished and disappointed at this conduct in Mr. Burke, as (from the circumstances I am going to mention) I had formed other expectations. I had seen enough of the miseries of war, to wish it might never more have existence in the world, and that some other mode might be found out to settle the differences that should occasionally arise in the neighbourhood of nations. This certainly might be done if Courts were disposed to set honesty about it, or if countries were enlightened enough not to be made the dupes of Courts.

Alcatraz Essay -- essays research papers

As the cold waters rush into the San Francisco Bay, they crash up against an island standing in the strait. This rock is hidden by the fog and isolated by the chilling waters of the Pacific that flow in and out every day. It has a gloom that hangs about its rocky face most know it as Alcatraz but the men who experienced this island, referred to her as â€Å"The Rock†. To the men confined there, it is not only the ultimate in isolation but the most ironic because they are there in the midst of the activity of a busy harbor with small craft darting to and from San Francisco, Oakland, Alameda, Berkeley, Richmond, and Sausalito; within sound of the honking horns of a ceaseless procession of automobiles crossing the bridges; within sight of ocean liners as they glide through the Golden Gate to far away ports in the vast Pacific, and within sight and sound of air clippers and their buzzing motors, all reminding them that life is near but freedom is so far. James A. Johnston Alcatra z was the dreaded prison of all criminals. This penitentiary was a sign of long term confinement and isolation. The island has gone through many changes in its time, from serving as a military fort in the mid 1850s, as a military prison in the early 1900s, as a national prison in the mid 1900s and, as it is today, serving as a national museum and park. The military took this island as a fort in 1909 and construction of a concrete cellblock was started on the uppermost plateau of the island. It was used as a military prison during these years. However, it soon became over crowded and three years later construction of the new cell house took place. Once completed, the inmates were moved into this cellhouse which had spacious cells, and more importantly, central heating. In addition, a well-equipped medical facility was now available onsite, thus eliminating the need to transfer sick, yet dangerous, inmates off the island for care in hospitals on the main land. Life on Alcatraz, popularly named as â€Å"The Rock†, was not easy for the inmates. During the early years on Alcatraz, incarceration meant hard labor on the grounds of the island. However, by the mid 20’s, rumors began to circulate about the country of unspeakable conditions the inmates had to endure on the island. Outcry from the public persisted, forcing the military to make a decision. Faced with the expense of operating the island an... .... The salt water from the bay had taken its toll on the prison. The concrete in the cellhouses and other buildings absorbed much of the salt from the air and were quickly disintegrating. This is why it was so easy for this last escape to take place. It was estimated that it would take close to 5 million dollars to repair Alcatraz. That was a cost that the government was not willing to spend. The operating costs of Alcatraz were also looked over. The cost of shipping food and other supplies to the island was becoming more expensive and it was found that it was no longer cost efficient to keep â€Å"The Rock† in use. In 1963 Alcatraz was closed down by the decision of Robert F. Kennedy. Despite the closing of Alcatraz as a prison, there is still activity among these rocks. This island, formerly a place of solitude and desolation, now serves as a National Park and museum. The Golden Gate National Recreation Area was established in 1972 and Alcatraz was included as one of these parks. Over one million people visit â€Å"The Rock† each year, including tourists from around the globe. The island of Alcatraz has become one of the most popular attractions in the Bay Area and its stories live on.

Homelessness Essay -- essays research papers

Homelessness in our society. The existence of homeless people in our society is still evident today. Everywhere you look around our cities, parks and streets it is likely that you will witness a homeless person struggling to survive. This is most certainly a social justice issue, every Australian deserves a secure and comfortable place to dwell, not left on the streets to perish. In society the rich get richer, and the poor get poorer. People today are far to driven by work and money to see the problem of homelessness surrounding them. Those very reasons explain why I chose this topic to create an advertising campaign. On the 23rd of June, 1987 the Hawke government promised us this. â€Å"For our next term, we are setting achievable goals for Australia’s future in the world†¦. So we set ourselves this goal: By 1990, no Australian child will be living in poverty.† If only this goal was achievable. Between the years of 1991 and 1994, the number of young Australians between the ages of twelve and eighteen living in poverty had doubled to twenty one thousand. The government does not do enough to help the homeless, although some people are homeless due to their own wishes, there are many people on the streets that do not choose to live as they do. People are homeless because they may have lost their jobs, evicted from their homes, teenagers that run away from families and teenagers that are ‘thrown away’ by families who no longer want them. Every year, nearly twenty seven thousa...

My Time in the Rainforest

Today was very productive day. I saw many things that I have never seen before in the Amazon rainforest. It is located in South America and is hugely populated with many different species. It is vast, covering an area of 2,5 million square miles, and we haven't even got one eight yet. Amazon river is one of the reasons the forest is so tremendously populated. It flows for more than 4,000 miles to discharge its waters in the Atlantic Ocean near Belem, Brazil. Along the way, about 1,100 tributaries latch on. One of the most seen birds was the Toucan. It was bigger then I thought it would be. Our guide told us that ten million species of plants, animals and insects live in the tropical forest. As it became dark, we stayed in the undergrowth of the forest where the tree could shade use from the hot sun we were expecting in the morning. The floor of the rain forest was sticky and wet from the rain that had fallen earlier this morning. It was hard to relax because of the weird weather. I could see a rainbow in the sky through the gaps between the canvas of leaves. As I got up, a spider monkey jumped down from the canopy and tried to grab the fruit we picked. We made a quick dash towards a giant tree trunk that had fallen. Thousands of small insects scattered as we approached it. We made a fireplace here to cook the raw meat we had brought. We fetched water from the Amazon river which was flowing near to camp and put in tablets to clean it. As we filled our bottles, piranhas swam towards our hands in the water. The Amazon river was a very dangerous place. –Day 2 24.09.10 We woke up at dawn when most of the animals would be sleeping. We saw an anaconda slither by. It was 21 feet long and I saw it choke a Giant Anteater. We were far away and the snake didn't spot us. A pack of squirrel monkeys passed us and we carried on through. It was getting cooler and there were less animals wandering about. More deadly animals started to appear, such as the poison dart frog. Our guide told us it is very small in size, but poisonous enough as to kill up to 100 people. It has the most powerful poison known by man, but harmless if left alone. Amazon Indians hunt using its poison in the tip of their arrows. –Day 3 25.09.10 We were heading towards Manaus, the weather in tropical areas have equatorial climate, found approximately 5 degrees to the North and South of the equator. Like any other tropical rainforest, it's hot and humid throughout the year, with an average annual temperature of 27à ¯Ã‚ ¿Ã‚ ½C