Batteries essays

Batteries essays As a child growing up, I was familiar with two types of batteries: the D size that was used in flashlights and the AA that was used for everything else. In todays society, technology is constantly changing and batteries are now becoming more and more advanced. We have seen the emergence of rechargeable batteries, lithium batteries, nickel cadmium batteries, nickel metal hydride batteries, lithium ion batteries, cordless power tool batteries, medical equipment batteries, batteries for communications, electronics, video, security devices, power tools, home appliances, battery powered toys, memory back-up and mobility. . Rechargeable batteries can only be re-charged so many times and the need for electricity is diminishing as batteries are becoming more powerful. They are now seen as a chokepoint in the use of alternative energy. Three sources of energy that I will focus on are Nickel Metal-Hydride, the new and improved Lithium Ion and Fuel Cells. Nickel Metal-Hydride (NiMH) batteries were introduced in the early 1990's as the new high-tech replacement over older chemistries like Nickel Cadmium (NiCd). Although they may have a very slight memory effect, NiMH batteries are much more reliable than previous chemistries. Compared to a NiCd battery of equal size, a NiMh battery will run for 30-40% longer on each charge. NiMH batteries can also be recharged 60% in just 15 minutes. Longer Nickel Metal Hydride batteries stay powered up longer, have no memory to drain and are environmentally friendly: mercury-free. Most new laptop computers and cordless phones are equipped with these cells now. One disadvantage of this battery is that its very sensitive to overcharging and complete discharging. The self discharge rate is very high so its not a good idea to leave them sitting around for even a couple of weeks. The introduction of lithium-ion technology represented a breakthrough in safety from the old lithium metal batteries. Lit...

Selena nguyen Essays (741 words) - Transport, Road Safety

Selena nguyen Essays (741 words) - Transport, Road Safety Selena nguyen Teenage driving When you were younger, did you ever ask your parents to drive you to your destinations, however they would say no? Growing up, children wait and wait until the day comes when they are finally sixteen and driving. They can now take themselves wherever they choose without relying on someone else. The law is deciding to increase the minimum driving age to eighteen. If the age does change, teenagers will have to wait longer until they are able to drive on their own. It can also affect many things that have already been established. Teen life, parent life, and teenagers' independence will be greatly affected. Teenagers benefit from driving at sixteen. Getting a driver's license early allows teens to work, enjoy extracurricular activities, and gain experience to prepare them for life after school. Teenagers who are employed learn how to function in a workplace. Employers prefer potential workers who have experience. Working gives teens a small fluid income. Teenagers who earn money learn valuable skills of saving money and personal finance. Along with having the ability to drive to work, teens with licenses can drive to extracurricular activities. Clubs and sports allow kids to discover and develop talents and interests. Adolescents find future careers in extracurricular activities. In addition, teens gain independence and life experience from driving. If the minimum driving age were to be raised to eighteen, many high school students would not be able to drive before they go to college. Driving is necessary for college. In order for college students to travel to classes, jobs, and housing , driving is a needed skill. The minimum driving age should not be changed. While this issue affects teens, it also has an effect on the parents. Parents welcome their children's independence. However, they appreciate it for different reasons. First, it allows parents to spend more time at work without making plans for their kids. This is especially useful when students live outside the bus area. Parents should not need to use their entire lunch break to drive their children home. Another reason teenagers should be able to drive at sixteen is so they can arrive at their extracurricular activities whenever needed. It saves parents from taking time off work to drive their children back and forth from school activities. If teenagers are able to drive, they can pick up younger siblings as well as drive themselves home. Finally, driving allows teenagers to transport themselves to and from jobs. Depending on the economic situation of the family, it could be helpful to have a small amount of easy income into the family for support. Teenagers who drive benefit their entire families. Parents, lawmakers, and even teenagers believe it is safer to wait until the age of eighteen. The opposition considers waiting until eighteen will teach teens responsibility and lower the chance of risk while driving. In driver's education, students are taught that during the first month of owning their license, new drivers are three times more likely to get into an accident. By waiting, new drivers will have more practice and experience driving. Sixteen year olds are more reckless and ill-prepared. At the age of eighteen, teenagers are more responsible and ready for maturity as they have finished their high school years and are going into college. Although the opposition believes young drivers are hazardous, the scenario would be similar to if teens had to wait until the age of eighteen. Due to waiting two more years for a license, teens will be restricted from traveling, causing a heavy reliance upon parents. Parents or guardians will have to leave their own occupation in order to help the child reach their destination. Parental jobs would become strained or even lost. Opportunities to make more money would disappear, hurting families' incomes and their financial status. In conclusion, the minimum driving age should not be raised from the age of sixteen. The effect on teens and their families would be too harsh. The independence that teens gain from driving at an early age allows them to obtain experience in the workplace and on the road. Furthermore, shortening their time on the road may result in more crashes. Parents of teens should not be obligated to drive

Ethical Issue. Should a nurse have authorization from the hospital to Article

Ethical Issue. Should a nurse have authorization from the hospital to assist a lucid and competent patient in writing a will. Discuss the pros - Article Example Five key themes emerged from the data. Findings suggest that both professions perceive primary educational roles, though their informational practices differed in content. The professionals reported differential pathways that led to their practices with patients. Both disciplines identified advocacy roles with families and providers. The practitioners reported distinct roles with families. There was mutual recognition of interdisciplinary roles. The findings suggest that nurses and social workers engage in both parallel and complementary advance care planning practices with their patients. Common wisdom holds that choice decisions are based on conscious deliberations of the available information about choice options. On the basis of recent insights about unconscious influences on information processing, we tested whether automatic mental associations of undecided individuals bias future choices in a manner such that these choices reflect the evaluations implied by earlier automatic associations. With the use of a computer-based, speeded categorization task to assess automatic mental associations (i.e., associations that are activated unintentionally, difficult to control, and not necessarily endorsed at a conscious level) and self-report measures to assess consciously endorsed beliefs and choice preferences, automatic associations of undecided participants predicted changes in consciously reported beliefs and future choices over a period of 1 week. Conversely, for decided participants, consciously reported beliefs predicted changes in automatic associations and future choices over the same period. These results indicate that decision-makers sometimes have already made up their mind at an unconscious level, even when they consciously indicate that they are still undecided. Twenty retrospective patient case studies were collated in an acute care teaching hospital using a case note audit and in addition interviews were

Strangers, babies (Theater Class) Essay Example | Topics and Well Written Essays - 1000 words

Strangers, babies (Theater Class) - Essay Example The director’s intent is to highlight the difficulty that people experience when attempting to relate to loved ones, especially with knowledge of their past mistakes and potential weaknesses. The director playwright and director chose an appropriate time to highlight this relationship deficiency, given the fact that the contemporary society is largely characterized by family disconnect and widespread disintegration of the family unit. This play attempts to show that people, have an individual burden, which is the lack of ability to understand how they associate with others, but still be responsible for pieces of information about their life experiences. Discussion The first scene of Strangers, Babies, begins with May steadily looking at the corner of the square shaped stage. The conversation, between May and her husband Dan, suggests that the direction to which she is staring is the couple’s apartment balcony. There is an injured bird and May seems concerned and willing to help it, as shown when she states that things can stay alive although they are injured. The presence of birds in the perceived balcony is indicated by high-pitched chirping sounds, which can be heard throughout this first scene. However, it is peculiar that although May is adamant about helping the bird, she is still reluctant to get involved. This serves to show that the protagonist is obsessive but distant at the same time. Dan looks at the balcony and occasionally at May in a knowing yet patronizing manner. He attempts to convince his wife that even though putting up a bird feeder on the balcony would be a caring gesture, it attracts more birds and there is a likelihood of getting additional injured birds. His patronizing attitude becomes evident when he uses a sarcastic tone to state that turning the balcony into a sanctuary for birds, would prevent him from engaging in his usual Sunday daydreaming involving newspaper reading and coffee drinking. It is obvious that there is affection between the two, but there is also an unsettling sensation. This is evident from May’s nearly desperate fixation on the injured bird and her apparent agitation as she slightly bangs her mug on the table, while her husband observes in a grave and sober manner. This scene provides a typical example of the atmosphere prevalent throughout the play, which constitutes disguised violence, careless attitude and ordinary daily life. From the play’s outset, the stage set-up evokes a feeling of disconnection. The stage is an ordinary square platform, which has a dividing space in between and high walls on either side. The director adds a dramatic effect to the play by concluding every scene with an abrupt and loud clang. This is followed by the rising of the back wall, in order to show the four other characters, who execute the subsequent scene change in a somber manner. Even though they are not explicitly mentioned, disturbing events in the protagonist’s past su ggest the possibility that, May’s current life is a sign of their impact. For instance, her monologue and distant look in the first scene makes one think that she is in deep thought about being injured in the past. The events in the play, just like the injured birds banging against the glass balcony door, constantly bang against May’s invisible past. These past events appear to increase the incapability of men

George Bush Speech Analysis Essay Example for Free

George Bush Speech Analysis Essay George Bush begins the speech with a solemn address and informs the people of America about the tragic events that unfolded. The aim of this speech was to reassure the public that they are now safe and the perpetrators will be brought to justice. The use of inclusive pronouns, such as ‘we’ and ‘our’, is just one of the ways in which he builds a sense of unity and togetherness with the audience. He makes it feel like he is equal to them and shares their pain and will help them through their struggles. In the second paragraph, Bush begins on talking about the severity of the attacks. He speaks about the variety of people that died, ‘the victims were on the airplanes, or in their offices-secretaries, businessmen and women, military and federal workers, moms and dads.’ As well as the victims in the plane, he includes the hard-working office workers and the devoted federal workers who lost their lives trying to save others. He ends the line with ‘moms and dads’ and ‘friends and neighbours’, trying to get empathy from the audience that little children have lost their parents and ordinary people have lost their close friends. Later on, George Bush then gives a sense of hope to the nation. He says that the attacks demonstrate the strength of the country and says America is the ‘brightest beacon for freedom’ and that the attacks ‘cannot touch the foundation of America’. George Bush then tries to take a little credit in the emergency response by using the words ‘I implemented’ so that the people still support him as a president. Bush then reassures the public by saying that he will ‘take every precaution to protect our citizens’. He goes on to show the stability of the financial institution and economy. President Bush then expresses his gratitude to the workers and congressmen who joined him strongly in condemning these acts. He talks about the other world leaders who offered their condolences by thanking them dearly. The tragedy of 9/11 was an awakening for America. George W. Bush effectively used the emotions of a saddened country and was able to win over the hearts of many Americans. The rhetorical devices and inclusive pronouns he included in his speech create a definite feeling of reassurance with the general public.

Wideman Vs. Limerick Essay example -- essays research papers

John Edgar Wideman’s â€Å"Our Time†, and Patricia Nelson Limerick’s â€Å"Empire of Innocence†, are two very different stories about one particular theme. In these selections both authors are writing history. Wideman is writing the history of his brother’s life, and Limerick is writing the history of the old west. Although the theme is the same, the two authors’ styles, methods, and writing concerns differ greatly.   Ã‚  Ã‚  Ã‚  Ã‚  In the following passage from â€Å"Our Time†, John is visiting his brother, Robby, in prison. While listening to Robby’s story, John begins to question the type of book this project will become: The business of making a book together was new for both of us. Difficult. Awkward. Another book could be constructed about a writer who goes to a prison to interview his bother but comes away with his own story†¦.the inevitible conflict between his role as detached observer and his responsibility as a brother would be at the center of such a book. When I stopped hearing Robby and listened to myself listening, that kind of book shouldered its way into my consciousness. I didn’t like that feeling. That book compromised the intimacy I wanted to achieve with my brother. (Wideman p. 723) This passage stresses the concern Wideman expresses on how to make this book the type of book he wants to present. Later in the selection the answer to this problem appears.   Ã‚  Ã‚  Ã‚  Ã‚  Still listening to Robby’s story, John discovers their recollections of th...

Online Dating

Online Dating â€Å"Are you ready to find the love of your lifer, â€Å"Experience the difference†, â€Å"Someone special is already waiting for you† are all different things you might hear on an online dating commercial, but is it really as good as they say? According to a study conducted by the Washington Post and PC World not even 20% of the connections made on these websites turn into committed relationships. Conventional dating is much safer and efficient than online dating in finding someone one actually wants to be with.Online dating may seem easier than conventional dating, but is that actually true? When diving into the world of online dating one cannot be completely sure that they are actually talking to that person. It could be someone acting as another person, or even a sex offender. Over 10% of all online dating users are considered to be sex offenders according to Reuters. Anyone can set up an online dating account whenever they please, and that can turn out to be dangerous because one never truly knows who they are connecting with.Conventional dating on the ther hand is usually much safer and there are multiple benefits to it that online dating doesn't have. The obvious benefit to conventional dating is that one is with that person face to face. It is very difficult to lie about height, weight, and age if the conversation is face to face, unlike online dating. According to a study most men lie about their height, weight, and income while women usually lie about their weight, physical build, and age. The odds are that your date will not be lying about their physical appearance on a face to face date.