Alternative-Fuel Vehicles Essay Example for Free

Alternative-Fuel Vehicles Essay Atmospheric pollution is a major problem nowadays. So it is important that we should immediately find alternative fuel sources for petroleum and reduce the emission of harmful gases in the atmosphere. This has been the dream of many scientists because this will significantly reduce the emission of carbon dioxide, a green house gas, to the atmosphere. Most of these fuels can be manufactured domestically so I cut the costs of importing from other countries. Some are even derived from renewable sources. Electric cars are now being manufactured globally. Unknown to many, electricity-powered cars came into the automotive scene before its diesel and petroleum counterpart. But due to the limitations of the technology in the past, its development was stopped and diesel cars became the standard car. Most of the problems electric cars faced points to the battery. Batteries were heavy and required recharging. But there are new developments in this technology. A battery now has longer life and comes in much lighter forms. The main drawback of this car is the distance it can travel before the batteries run out. If there are enough recharging stops, like gas stations, the electric car will prove itself as a fuel-efficient and environment-friendly car. Natural gas cars are also gaining popularity. The promise of being able to fuel the car at one’s own home is hard to deny. Honda calls it a personalized solution to the fact that gasoline stations don’t sell natural gas. The Honda model Civic GX is coined as the cleanest internal combustion engine-powered vehicle ever tested by Environmental Protection Agency. However, natural gas is not renewable. A potential advantage of Hydrogen cars is that it can be used over and over again by the process of electrolysis. Although the supply hydrogen is not limited as fossil-fuels, production of such cars doesn’t come at a cheap price. Hydrogen has many advantages if used to fuel cars, but currently it is very expensive. Some car companies offer to convert diesel cars into hydrogen cars, but most of the time the price of conversion is much more expensive than the original price of the car. Also, hydrogen in normal temperature is gas and to be used as fuel it should be squeezed in high pressures so it is somewhat difficult to contain. Fuel cell cars are definitely a technology to watch for. It has the potential to minimize the use of energy while reducing harmful emissions at the same time. What sets it above the others is that it can make its own energy through certain chemical processes. Also, fuel cell cars don’t emit pollutants. But the price is almost the same for hydrogen cars, if not higher. The developments in fuel cells is rather young, it is not yet tested as compared to other alternative fuels, so it would be a risk if we utilize this technology right away. Among these alternative sources of energy, I choose natural gas. The other alternatives may score a higher grade in terms of energy advantage and minimal emission, but they are too expensive. The economy will suffer as we save the environment using Hydrogen, Electric, and Fuel Cell cars. Natural gas is widely distributed around the world. New natural gas reserves are discovered as time pass, it is just waiting for us to harness fuel from it. Most countries will be able to tap their own resources and strengthen one’s economy. The production of cars and fuel supply for natural gas cars is also very feasible compared to the other alternatives. Atmospheric pollution is increasing during each day. And since natural gas is the cheapest, we can immediately put it to use. This is the realistic approach concern the threat of global warming. We put into use something that works and will be a benefit for both the economy and environment. And after we became successful in harnessing natural gas, and the economic condition permits it, it is the time to upgrade to hydrogen or fuel cells and completely eliminate harmful emissions from vehicles.

Television Vs Movies Essay -- essays research papers

Before there was television and motion pictures (movies), people used to spend their leisure time listening to the radio. They were offered little variety and often routinely listened to the same things. In the late 1800’s and early 1900’s, motion pictures and television were invented, respectively. In the beginning, they were considered luxuries. As time wore on, they became increasingly more and more popular. Today they are both extremely common forms of entertainment. Though they are both very popular, they are also very different.   Ã‚  Ã‚  Ã‚  Ã‚  Going to the movies offers a complete escape from everyday life for a few hours at a time. In movies, a story can usually be told from beginning to end in a short period of time. Movies allow a person to get completely wrapped ...

Wired and Wireless Networks

Wired and Wireless, What’s the Difference? The main difference between a wired and wireless data communication infrastructure is the existence of physical cabling. The same or similar techniques are employed for both types of data communication infrastructure in terms of the core elements of essential network services. The basic difference between a wired and a wireless network is self-explanatory. A wired network uses wires to communicate whereas a wireless network uses radio waves. Another difference and how one technology gets an edge over the other. Wired networks are easy to set up and troubleshoot where wireless networks are comparatively difficult to set up, maintain, and troubleshoot. Wired networks make you immobile while wireless ones provide you with convenience of movement. A third difference, wired networks prove expensive when covering a large area because of the wiring and cabling while wireless networks do not involve this cost. Wired networks have better transmission speeds than wireless ones. In a wired network, user does not have to share space with other users and thus gets dedicated speeds while in wireless networks, the same connection may be shared by multiple users. One of the most common questions we have to answer on a daily basis is the difference between wired and wireless networks. Wired is the communication between two devices via cables. Wireless is the communication between two devices without cables. Now, is it that simple? Each method of networking has its own pros and cons. Wireless networks do not use any form of cable. The transmission of data occurs over radio waves just like cordless phones or the Bluetooth headset that came with that phone you purchased . There are many advantages, but the major advantage of having a wireless device is the mobility and freedom that comes with it. There is less clutter and fewer wires to worry about. But, you sacrifice in most cases on speed and security. Wired networks on the other hand have been around for some time now. Officially known today as the Ethernet, the cables usually connect these devices using CAT5 cables. The speed and security in this scenario are greatly enhanced. The latest Ethernet routers can support up to 1000Mb/s or a Gigabit/second, that’s ten times faster than the widely used 100 Mb/s router. However the overall cost of a wired network is lower and provides high performance and better security than wireless networks. As home users, wireless networks have become the choice. A wireless network saves your time and efforts in installing a lot of cables. Also, if you need to relocate a client machine in your office, you only need to move the computer with wireless network. Wireless networking is very useful in the public places, libraries, hotels, schools, airports, train stations. A drawback in the wireless internet is that quality of service, it is not guaranteed if there is any interference. Then the connection may be dropped. Wireless local area networks allow users in local area, such as in a university or a library to join a network and gain wireless access to the internet. A temporary network can be formed by a small number of users without the need of access points. Service Set Identifier acts a simple password by allowing WLAN network to be split up into different networks and each having a unique identifier. These identifiers are configured in multiple access points. To access any of the networks, a computer is configured in such a way that each is having a corresponding identifier for that network. If they match between the two computers or networks then access is granted. This is a good security method but it is mainly involved in the small wireless networks because there is more manual work is involved, entering the MAC address into the Access point. Wireless networking is very popular in home networking and more than 20 percent of homes with broadband internet are using wireless networks and this number is increasing. In a general estimate worldwide hotspots have now reached more than 30,000 and will grow about 210,000 in the next few years. Most large hotels already offer Wi-Fi and the business travelers are willing to pay for the wireless access. 802. 11 is the next Wi-Fi speed standard. It is set to offer bandwidth around 108Mbps and is still under development. With the speed of 70 Mbps and a range up to 30 miles, the 802. 1 standard, known as Wimax is sure to give a boost to wireless networking. The term wireless networking refers to technology that enables two or more computers to communicate using standard network protocols, but without network cabling. Any technology that does this could be called wireless networking. This technology, fueled by the emergence of cross-vendor industry standards such as IEEE 802. 11, has pro duced a number of affordable wireless solutions that are growing in popularity with business and schools as well as sophisticated applications where network wiring is impossible, such as in warehousing or point-of-sale handheld equipment. An ad-hoc, or peer-to-peer wireless network consists of a number of computers each equipped with a wireless networking interface card. Each computer can communicate directly with all of the other wireless enabled computers. They can share files and printers this way, but may not be able to access wired LAN resources, unless one of the computers acts as a bridge to the wired LAN using special software. Each computer with a wireless interface can communicate directly with all of the others. A wireless network can also use an access point, or base station. In this type of network the access point acts like a hub, providing connectivity for the wireless computers. It can connect (or â€Å"bridge†) the wireless LAN to a wired LAN, allowing wireless computer access to LAN resources, such as file servers or existing Internet Connectivity. That’s the different between wired and wireless network. BIBLIOGRAPHY 1. http://computer. howstuffworks. com/home-network2. htm 2. http://en. wikipedia. org/wiki/Wireless_network 3. http://www. broadbandbuddy. com. au/wireless-broadband/wireless-networks-vs-wired-networks

Medeo is a Play Based on the Myth of Jason and Medea...

Medea is a play based on the myth of Jason and Medea written by Euripides. The play involves the love between two mythical characters: Jason and Medea. The play reaches its climax when Medea is betrayed by Jason when he choses another woman for her youthful beauty. Euripides is able to involve the audience by using dramatic scenery on how Medea choses to respond to this theatrical situation according to the patriarchal culture she lives in. Furthermore, the analysis focuses upon the system of masculinity and femininity with regards to how Medea assesses the best approach in seeking to fight back against the predominant practices and norms of patriarchy that existed in her time. This play further highlights the role of love and the significance it has over family. It is necessary for the audience to understand the fundamental backbone and rubric of the story; the way in which Medea turns her back upon cultural definitions of patriarchy. Sympathizing and understanding the betrayal with in the male-controlled society is unequal, due to the fact that men are typically understood within patriarchal societies to serve as the protectors and guardians of women while this is not the case with Medea as she is more superior to Jason. Unsurprisingly, the role of women in this play automatically assumes that they are the weaker and less important sex so therefore need the dominating actions of men as a means of protecting their femininity. Firstly, Medea ultimately saw the status quo of