Biography of Georg Simon Ohm Essay Essay Example

Biography of Georg Simon Ohm Essay Essay Example Biography of Georg Simon Ohm Essay Paper Biography of Georg Simon Ohm Essay Paper Georg Simon Ohm ( 16 March 1787 – 6 July 1854 ) was a Bavarian ( German ) physicist and mathematician. As a high school instructor. Ohm began his research with the new electrochemical cell. invented by Italian scientist Alessandro Volta. Using equipment of his ain creative activity. Ohm found that there is a direct proportionality between the possible difference ( electromotive force ) applied across a music director and the attendant electric current. This relationship is known as Ohm’s jurisprudence. Ohm died in Munich in 1854. and is buried in the Alter Sudfriedhof. Early old ages Georg Simon Ohm was born into a Protestant household in Erlangen. Bavaria. ( so a portion of the Holy Roman Empire ) boy to Johann Wolfgang Ohm. a locksmith and Maria Elizabeth Beck. the girl of a seamster in Erlangen. Although his parents had non been officially educated. Ohm’s male parent was a well-thought-of adult male who had educated himself to a high degree and was able to give his boies an first-class instruction through his ain instructions. Of the seven kids of the household merely three survived to adulthood: Georg Simon. his younger brother Martin. who subsequently became a well-known mathematician. and his sister Elizabeth Barbara. His female parent died when he was ten. From early childhood. Georg and Martin were taught by their male parent who brought them to a high criterion in mathematics. natural philosophies. chemical science and doctrine. Georg Simon attended Erlangen Gymnasium from age eleven to fifteen where he received small in the country of scientific preparation. which aggressively contrasted with the divine direction that both Georg and Martin received from their male parent. This characteristic made the Ohms bear a resemblance to the Bernoulli household. as noted by Karl Christian von Langsdorf. a professor at the University of Erlangen. Life in university Georg Ohm’s male parent. concerned that his boy was blowing his educational chance. sent Ohm to Switzerland. There in September 1806 Ohm accepted a place as a mathematics instructor in a school in Gottstadt bei Nydau. Karl Christian von Langsdorf left the University of Erlangen in early 1809 to take up a station in the University of Heidelberg and Ohm would hold liked to hold gone with him to Heidelberg to re-start his mathematical surveies. Langsdorf. nevertheless. advised Ohm to go on with his surveies of mathematics on his ain. reding Ohm to read the plants of Euler. Laplace and Lacroix. Rather reluctantly Ohm took his advice but he left his learning station in Gottstadt bei Nydau in March 1809 to go a private coach in Neuchatel. For two old ages he carried out his responsibilities as a coach while he followed Langsdorf’s advice and continued his private survey of mathematics. Then in April 1811 he returned to the University of Erlangen. His private surveies had stood him in good position for he received a doctors degree from Erlangen on 25 October 1811 and instantly joined the staff as a mathematics lector. After three semesters Ohm gave up his university station. He could non see how he could achieve a better position at Erlangen as chances there were hapless while he basically lived in poorness in the lecture station. The Bavarian authorities offered him a station as a instructor of mathematics and natural philosophies at a hapless quality school in Bamberg and he took up the station at that place in January 1813. This was non the successful calling envisaged by Ohm and he decided that he would hold to demo that he was deserving much more than a instructor in a hapless school. He worked on composing an simple book on the instruction of geometry while staying urgently unhappy in his occupation. After Ohm had endured the school for three old ages it was closed down in February 1816. The Bavarian authorities so sent him to an overcrowded school in Bamberg to assist out with the mathematics learning. On 11 September 1817 Ohm received an offer of the station of instructor of mathematics and natural philosophies at the Jesuit Gymnasium of Cologne. This was a better school than any that Ohm had taught in antecedently and it had a well equipped natural philosophies laboratory. As he had done for so much of his life. Ohm continued his private surveies reading the texts of the taking Gallic mathematicians Lagrange. Legendre. Laplace. Biot and Poisson. He moved on to reading the plants of Fourier and Fresnel and he began his ain experimental work in the school natural philosophies research lab after he had learnt of Oersted’s find of electromagnetism in 1820. At first his experiments were conducted for his ain educational benefit as were the private surveies he made of the pla nts of the prima mathematicians. The Jesuit Gymnasium of Cologne failed to go on to maintain up the high criterions that it had when Ohm began to work at that place so. by 1825. he decided that he would seek once more to achieve the occupation he truly wanted. viz. a station in a university. Gaining that the manner into such a station would hold to be through research publications. he changed his attitude towards the experimental work he was set abouting and began to consistently work towards the publication of his consequences [ 1 ] : Overburdened with pupils. happening small grasp for his painstaking attempts. and gaining that he would neer get married. he turned to science both to turn out himself to the universe and to hold something solid on which to establish his request for a place in a more stimulating environment. In fact he had already convinced himself of the truth of what we call today â€Å"Ohm’s law† viz. the relationship that the current through most stuffs is straight relative to the p ossible difference applied across the stuff. The consequence was non contained in Ohm’s number ones paper published in 1825. nevertheless. for this paper examines the lessening in the electromagnetic force produced by a wire as the length of the wire increased. The paper deduced mathematical relationships based strictly on the experimental grounds that Ohm had tabulated. In two of import documents in 1826. Ohm gave a mathematical description of conductivity in circuits modelled on Fourier’s survey of heat conductivity. These documents continue Ohm’s tax write-off of consequences from experimental grounds and. peculiarly in the 2nd. he was able to suggest Torahs which went a long manner to explicating consequences of others working on voltaic electricity. The 2nd paper surely is the first measure in a comprehensive theory which Ohm was able to give in his celebrated book published in the undermentioned twelvemonth. Teaching calling Ohm’s ain surveies prepared him for his doctors degree which he received from the University of Erlangen on October 25. 1811. He instantly joined the module at that place as a lector in mathematics but left after three semesters because of unpromising chances. He could non last on his wage as a lector. The Bavarian authorities offered him a station as a instructor of mathematics and natural philosophies at a hapless quality school in Bamberg which Ohm accepted in January 1813. Unhappy with his occupation. Georg began composing an simple text edition on geometry as a manner to turn out his abilities. Ohm’s high school was closed down in February 1816. The Bavarian authorities so sent him to an overcrowded school in Bamberg to assist out with the instruction of mathematics. Memorial for Ohm at the Technical University of Munich. Campus Theresienstrasse After his assignment in Bamberg. Ohm sent his completed manuscript to King Wilhelm III of Prussia. The King was satisfied with Ohm’s book. and offered Ohm a place at the Jesuit Gymnasium of Cologne on 11 September 1817. This school had a repute for good scientific discipline instruction and Ohm was required to learn natural philosophies in add-on to mathematics. The natural philosophies research lab was well-equipped. leting Ohm to get down experiments in natural philosophies. As the boy of a locksmith. Ohm had some practical experience with mechanical devices. Ohm published Die galvanishe Kette. mathematisch bearbeitet ( The Galvanic Circuit Investigated Mathematically ) in 1827. Ohm’s college did non appreciate his work and Ohm resigned from his place. He so made an application to. and was employed by. the Polytechnic School of Nuremberg. Ohm arrived at the Polytechnic School of Nuremberg in 1833. and in 1852 he became a professor of experimental natural philosophies at the University of Munich. The find of Ohm’s jurisprudenceFurther information: Ohm’s Law Ohm’s jurisprudence foremost appeared in the celebrated book Die galvanische Kette. mathematisch bearbeitet ( tr. . The Galvanic Circuit Investigated Mathematically ) ( 1827 ) in which he gave his complete theory of electricity. In this work. he stated his jurisprudence for electromotive force moving between the appendages of any portion of a circuit is the merchandise of the strength of the current. and the opposition of that portion of the circuit. The book begins with the mathematical background necessary for an apprehension of the remainder of the work. While his work greatly influenced the theory and applications of current electricity. it was in cold blood received at that clip. It is interesting that Ohm presents his theory as one of immediate action. a theory which opposed the construct of action at a distance. Ohm believed that the communicating of electricity occurred between â€Å"contiguous particles† which is the term Ohm himself used. The paper is concerned with this thought. and in peculiar with exemplifying the differences in this scientific attack of Ohm’s and the attacks of Joseph Fourier and Claude-Louis Navier. A elaborate survey of the conceptual model used by Ohm in bring forthing Ohm’s jurisprudence has been presented by Archibald. The work of Ohm marked the early beginning of the topic of circuit theory. although this did non go an of import field until the terminal of the century. Ohm’s acoustic jurisprudence Further information: Ohm’s acoustic jurisprudence Ohm’s acoustic jurisprudence. sometimes called the acoustic stage jurisprudence or merely Ohm’s jurisprudence. provinces that a musical sound is perceived by the ear as a set of a figure of constitutional pure harmonic tones. It is good known to be non rather true. Plant * Guidelines for an appropriate intervention of geometry in higher instruction at preparatory institutes / notes* The Galvanic Circuit Investigated Mathematically* Elementss of analytic geometry refering the skew co-ordinate system* Fundamentalss of natural philosophies: Collection of talks

Human Nature Essay Example | Topics and Well Written Essays - 250 words - 1

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The Key Agent of Socialization Assignment Example | Topics and Well Written Essays - 250 words

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Examining The Network Simulations Of NS2 Information Technology Essay

Examining The Network Simulations Of NS2 Information Technology Essay NS2 is a Linux based tool to perform network simulations. NS2 is based on C++ and TCL programming Languages. TCL uses simple commands to define network configuration and C++ allows users to adjust protocol functionalities in detail and also to define new protocols. Our Project involves simulation of VoIP over two transport layer protocols UDP and SCTP. Installation of NS2: Installation of NS2 involves many steps. These Steps are: Checking for pre-requisites: Please make sure that you have installed the fedora 12 O.S with all packages and you are logged in as administrator. Downloading latest version of NS2: We first Downloaded NS2 v. 2.34 from: http://sourceforge.net/projects/nsnam/files/allinone/ns-allinone-2.34/ns-allinone-2.34.tar.gz/download Extracting the NS2 package: Extract the contents of .tar file in a directory and go into that directory. The following snapshot shows the extracted file against .tar file. Patching of SCTP module: Initially NS2 does not provide support to SCTP, so we have to download apply its patch before installation of NS2. The patch can be downloaded from http://pel.cis.udel.edu Now untar the patch in a directory and type the given command in terminal: patch -p0 Now we are ready to install NS2 with SCTP module. Installation of NS2 : We can either install NS2 by typing commands in the terminal. Or we can do this by simply double clicking the install file. The snapshot below shows the later. Now the installation has started. It would take some time to complete it. Configuring the installation path of NS2: The terminal will get get closed after installation of NS2. Now open terminal again and type: gedit ~/.bashrc to configure the path file Now edit this file as in the figure: Now save and close bash file and type following command in the terminal to tell your O.S about the path of NS2: source ~/.bashrc Confirming the installation of NS2: To confirm that NS2 is correctly installed, type ns in the terminal. The outlook of the terminal will be changed in this way: (Else it would print some filter of error in the terminal.) To revert to the normal mode type exit in the terminal. Running a simple code on NS2: NS2 executes .tcl file format. If you have followed all the previous steps, then you can execute a .tcl file by typing the following syntax in the terminal: ns [file name].tcl But make sure you are the directory where the .tcl file is present. e.g: Here we have a sample code script.tcl. In this code we are simulating a simple topology of two wired nodes. On typing ns script.tcl in the terminal, we get the following output: Handling the output trace file: On execution of .tcl code, two output files are generated. One is the .nam file with which we see the graphical simulation of our code. The other one is the .tr trace file, with which we can analyze the output of our simulation. The trace file looks like: It contains various parameters such as arrival time of packets, packet size transport agent etc. Using the trace file, we can get the graphical outputs to analyze the behavior of our simulation. To do this we need a graph drawing software such as xgraph or gnuplot. Here we are using gnuplot. But to draw a graph, we need to filter the trace file and get the coordinates out of which we can draw a graph. To filter a trace file, we write an awk script. Since we have to draw graphs for latency and throughput, therefore we will write one script for each type of graph. The awk script for latency is: #latency BEGIN { time1 = 0.0; time2 = 0.0; } { time2 = $2; if ($1==r) { printf(%f %fn, time1, time2) > latency; time1 += $2; } } END { print(Done); } And awk script for throughput is: #throughput BEGIN { node =1; time1 = 0.0; time2 = 0.0; num_packet=0; bytes_counter=0; } { time2 = $2; if (time2 time1 > 0.05) { thru = bytes_counter / (time2-time1); thru /= 1000000; printf(%f %fn, time2, thru) > throughput; time1 = $2; } if ($1==r) { bytes_counter += $6; num_packet++; } } END { print(Done); } Now type the following command in the terminal to filter the trace file: gawk file=[awk file name].awk [trace file name].tr The filtered file would be like this: Now weve to give a plot for which our graph is to be ploted. (i.e: weve to tell about the x and y coordinates) So we create a simple file in which we tell about these parameters. set title VoIP over UDP Latency! set grid set ylabel s set xlabel time plot latency w linespoints title voip throughput Now type gnuplot in the terminal to enter into gnuplot mode. Here type the command: load [x-y parameters file] (inner double quotes inclusive) And type exit to exit gnuplot Formation of VOIP Traffic over the Network: VoIP (Voice over IP) is simply the transmission of voice traffic over IP-based networks. The Internet Protocol (IP) was originally designed for data networking.   It is also referred to as IP  Telephony  or Internet Telephony. Simulating VOIP in NS2: VoIP is basically just UDP packets encapsulating RTP packets with the voice data inside, all you should need to do to simulate a VoIP stream is set the correct packet size and frequency that the packets are sent out and that would simulate a stream. In NS2 we will implement VOIP over UDP and SCTP protocols. We will implement VOIP using a simple two-node topology. For this we will do the following steps: create two .tcl files simulate VOIP traffic handle the trace files to draw graphs for latency and throughput for evaluation between the two protocols Simulation of VoIP over the network using UDP: Creating the tcl file:- First create a tcl file for Voip simulation over UDP protocol. Given below is the source code for our file voip_udp.tcl # start new simulation set ns [new Simulator] # setup tracing/nam set tr [open voip.tr w] set nf [open voip.nam w] $ns trace-all $tr $ns namtrace-all $nf # finish function, close all trace files and open up nam proc finish {} { global ns nf tr $ns flush-trace close $nf close $tr exec nam voip.nam exit 0 } ### creating nodes set node0 [$ns node] $node0 label Voice 1 $node0 color red set node1 [$ns node] $node1 label Voice 2 $node1 color blue # creating duplex-link $ns duplex-link $node0 $node1 256Kb 50ms DropTail $ns duplex-link-op $node0 $node1 orient right # setup colors $ns color 1 Yellow $ns color 2 Green ## 2-way VoIP connection #Create a UDP agent and attach it to node0 set udp0 [new Agent/UDP] $ns attach-agent $node0 $udp0 # set udp0 flowid to 1 $udp0 set fid_ 1 # Create a CBR traffic source and attach it to udp0 set cbr0 [new Application/Traffic/CBR] $cbr0 set packetSize_ 128 $cbr0 set interval_ 0.020 # set traffic class to 1 $cbr0 set class_ 1 $cbr0 attach-agent $udp0 # Create a Null sink to receive UDP set sinknode1 [new Agent/LossMonitor] $ns attach-agent $node1 $sinknode1 # Connect the UDP traffic source to Null sink $ns connect $udp0 $sinknode1 set udp1 [new Agent/UDP] $ns attach-agent $node1 $udp1 $udp1 set fid_ 2 set cbr1 [new Application/Traffic/CBR] $cbr1 set packetSize_ 128 $cbr1 set interval_ 0.020 $cbr1 set class_ 2 $cbr1 attach-agent $udp1 set sinknode0 [new Agent/LossMonitor] $ns attach-agent $node0 $sinknode0 $ns connect $udp1 $sinknode0 # end of voice simulation setup # start up traffic $ns at 0.1 $cbr0 start $ns at 0.1 $cbr1 start $ns at 10.0 $cbr0 stop $ns at 10.0 $cbr1 stop $ns at 10.5 finish # run the simulation $ns run Simulate VOIP traffic: Now type the following command in the terminal to view simulation of VOIP over UDP: ns voip_udp.tcl The output is: Performance of SCTP: Now we draw the graphs with gnuplot using above mentioned steps. The performance is evaluated on the basis of latency, throughput and capacity. The capacity can be evaluated with the help of latency and throughput. Latency: Throughput: Simulation of VoIP over the network using SCTP: Creating the tcl file:- First create a tcl file for Voip simulation over UDP protocol. Given below is the source code for our file voip_sctp.tcl # start new simulation set ns [new Simulator] # setup tracing/nam set tr [open voip.tr w] set nf [open voip.nam w] $ns trace-all $tr $ns namtrace-all $nf # finish function, close all trace files and open up nam proc finish {} { global ns nf tr $ns flush-trace close $nf close $tr exec nam voip.nam exit 0 } ### creating nodes set n0 [$ns node] $n0 label Voice 1 $n0 color red set n1 [$ns node] $n1 label Voice 2 $n1 color blue # creating duplex-link $ns duplex-link $n0 $n1 256Kb 50ms DropTail $ns duplex-link-op $n0 $n1 orient right # setup colors $ns color 1 Yellow $ns color 2 Green ## 2-way VoIP connection #Create a UDP agent and attach it to n0 set sctp0 [new Agent/SCTP] $ns attach-agent $n0 $sctp0 $sctp0 set fid_ 1 set cbr0 [new Application/Traffic/CBR] $cbr0 set packetSize_ 128 $cbr0 set interval_ 0.020 # set traffic class to 1 $cbr0 set class_ 1 $cbr0 attach-agent $sctp0 # Create a Null sink to receive Data set sinknode1 [new Agent/LossMonitor] $ns attach-agent $n1 $sinknode1 set sctp1 [new Agent/SCTP] $ns attach-agent $n1 $sctp1 $sctp1 set fid_ 2 set cbr1 [new Application/Traffic/CBR] $cbr1 set packetSize_ 128 $cbr1 set interval_ 0.020 $cbr1 set class_ 2 $cbr1 attach-agent $sctp1 set sinknode0 [new Agent/LossMonitor] $ns attach-agent $n0 $sinknode0 $ns connect $sctp0 $sctp1 $ns at 0.1 $cbr0 start $ns at 0.1 $cbr1 start # stop up traffic $ns at 10.0 $cbr0 stop $ns at 10.0 $cbr1 stop # finish simulation $ns at 10.5 finish # run the simulation $ns run Simulate VOIP traffic: Now type the following command in the terminal to view simulation of VOIP over UDP: ns voip_sctp.tcl The output is: Performance of SCTP: Now we draw the graphs with gnuplot using above mentioned steps. The performance is evaluated on the basis of latency, throughput and capacity. The capacity can be evaluated with the help of latency and throughput. Latency: Throughput: Difference between SCTP and UDP: SCTP: SCTP Stands for Stream Control Transmission Protocol. It is a Transport Layer protocol. It is a connection-oriented protocol similar to TCP, but provides facilities such as multi-streaming and multi-homing for better performance and redundancy. It is used in Unix-like operating systems. UDP: UDP stands for User Datagram Protocol. It is a minimal message-oriented transport layer protocol. It enables two hosts to connect and send short messages to one another. Unlike Transmission Control Protocol (TCP), it does not guarantee that data is received or that it is received in the order in which it was sent. Comparison between SCTP and UDP: Message Orientation: In SCTP, message boundaries are preserved. If an application sends a 100-byte message, the peer application will receive all 100 bytes in a single read: no more, no less. UDP provides a message-oriented service, but without SCTPs reliability. Un-Ordered Service: In addition to ordered message service (and parallel ordered service discussed above), SCTP offers the reliable delivery of messages with no order constraints. UDP provides unordered service, but again without SCTPs reliability. Unordered reliable delivery will be useful for many applications, in particular disk over LAN services (iSCSI, RDMA, etc.) where the application already provides ordering. Stronger checksum: SCTP uses a 32-bit end-to-end checksum proven to be mathematically stronger than the 16-bit ones-complement sum used by UDP. SCTPs better checksum provides stronger verification that a message passes end-to-end without bit errors going undetected. These were some of the differences between SCTP and UDP. A tabulated contrast between the two protocols is given below: Services/Features SCTP UDP Connection-oriented yes no Full duplex yes yes Reliable data transfer yes no Partial-reliable data transfer optional no Ordered data delivery yes no Unordered data delivery yes yes Flow control yes no Congestion control yes no ECN capable yes no Selective ACKs yes no Preservation of message boundaries yes yes Path MTU discovery yes no Application PDU fragmentation yes no Application PDU bundling yes no Multistreaming yes no Multihoming yes no Protection against SYN flooding attacks yes n/a Allows half-closed connections no n/a Reachability check yes no Psuedo-header for checksum no (uses vtags) yes Time wait state for vtags n/a SCTP vs. UDP Latency: From the graphs of latency we conclude that latency is slightly higher in UDP. In real practice, latency in UDP is much higher than in SCTP. Practically, the latency in UDP is about 15% more than SCTP. Throughput: From the graphs of throughput we see that UDP shows a constant but less throughput while SCTP shows continuous fluctuations in its graph. But overall SCTP has a higher throughput than UDP. In real practice, throughput in SCTP is about 15% more than in UDP. Capacity: By observing the graphs of throughput, we conclude the SCTP can support more capacity than UDP. UDP will loose its performance at higher data rates. Conclusion: From the above statistics, we conclude that SCTP is better than UDP in terms of latency, throughput and capacity. Therefore there is no doubt in the fact that that SCTP is going to be the future of VOIP and many other network technologies. But since this technology is under the process of evolution so it may take some time for it to replace the older technologies like UDP and TCP etc. Refrences: http://yonghoon.livejournal.com/4799.html http://www.isoc.org/briefings/017/index.shtml http://www.google.com/dictionary?source=dict-chrome-exsl=entl=enq=sctp http://www.google.com/dictionary?langpair=en|enq=udphl=enaq=f http://mailman.isi.edu/pipermail/ns-users/2006-August/056723.html http://books.google.com.pk/books?id=bF3L7g1u_mQCpg=PA189lpg=PA189dq=udp+vs+sctp+latency+throughputsource=blots=zdb5JeCsMfsig=PPt8c4nvtcrIJcXr5eKBIe_GbkQhl=enei=XhIgTYCeLs-z8QO8_KS8BQsa=Xoi=book_resultct=resultresnum=2ved=0CB4Q6AEwAQ#v=onepageqf=true

Patterns for College Writing Essay

  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚   I spent the night before contemplating how I was going to get out of school on Thursday.   There was a social studies test I didn’t study for and I just could not bare another day of dodge ball.   On the morning of September 11, 2001 I woke up â€Å"sick†.   I pleaded with my mother, and took a fake trip to the bathroom because I was going to â€Å"vomit†.   Finally, I was allowed to stay home.   At 6:00 am,   I was ordered to go back to sleep and I did.   I looked forward to my day alone as I lingered between sleeping and waking pondering how I was going to fill my day with – snacks, computer games, and loud music. September 11, 2001 began as a childhood scheme and it ended with me growing up.   Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚   I dozed much of the morning and awoke to the sound of my brother’s radio alarm going off.   It was Thursday and he shouldn’t be home.   I pouted as I slowly got out of bed to see if I was truly alone.   I walked down the hall and stopped briefly at the bathroom and then into my brother’s room.   He was gone, and the alarm had been set wrong.   The people on the radio droned on and on.   I wandered around the room hoping to find a magazine that I let brat borrow weeks ago. As I was on my knees peaking under the bed the words on the radio became clear.   I heard the word â€Å"terrorists† and the fragments of statements like â€Å"hundreds died this morning when†.   Then, I could only hear my heart beat in my ears.  Ã‚   I got to my feet and for the first time since being a child, I felt real panic. The sort of panic you feel when you are four and you have wandered away from your parents.   Once I caught my breath I made my way to the family room, frantically searching for the remote.   I turned on the television to MSNBC and the first image I saw was a man jumping from a broken window of one of the twin towers.   I was baffled and this would be the image that would haunt my dreams, my waking memories, and what it meant to be an American.   Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚   I heard the details over and over again.   The errorists had hijacked three planes and deliberately crashed them into the Pentagon and the Twin Towers.   The video clips played again and again on the news.   The smoke filled horizons around the crumbling buildings.   Paper was flying everywhere and the sound of heart broken people wailing in the background filled the screen.   I stared and there were moments where I thought it might be a movie and all I had to do was change the channel.   The phone must of rang a dozen times before I answered it   It was my mother on the other end, asking me again and again if I was ok.  Ã‚   She told me she would be home soon.   I waited, though I did not know for what, and watched.   The Towers were now in flames as the reporters spoke in what seem like whispers.   Their words almost silenced but the sound of a city slowly dying.   Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚   I remember hearing the back door open and close, and my mother sitting down next to me.   It was the first time since I was a child that she held my hand and I let her.   Stunned, we sat together as the news reported that at 8:40 am the terrorists crashed planes into the World Trade Center.   It was hard to comprehend.   My mother cried and I cried too except on the inside.   I watched her body shake as she twisted her ring around and around her finger.   My mother, who could out talk just about everyone we knew, was speechless.   It was then that I understood – she was scared too.   I hugged my mother and told her everything would be all right.   I told her we would be safe and that we had each other.   I made us coffee and we spent much of the afternoon talking about what happened, what could happen, and what we would do.   What we spoke about most was â€Å"why†.   Why did the terrorists hate Americ a?   Why did people kill other people for no apparent reason?   Comforting my   mother in the ways she had comforted me for so many years, came unexpectedly to me.   Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚   Over the next few months we followed the story as did the world.   I can remember President Bush attempting to comfort the United States and telling us America would be going to war for reasons that weren’t clear to me then and certainly aren’t clear to me now.   Suddenly video games and staying home from school just weren’t important anymore.   Dodge ball did not seem so bad.   Instead of hiding from my parents I sought them out, wanting to discuss my day and theirs together.   I do not believe what does not kill us makes us stronger.   However, I think that what does not kill us makes truly value what we have in life and to realize how much our family and friends mean to us.   Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚   My family and I became very active in volunteer activities especially with the Red Cross.   We donated bottled water, clothing, blankets, and food.   Our community held local charity events to raise money for the victims of September 11 including those firemen and police officers who gave their lives in the fires of 9/11.   It was the first time I or my family had ever become involved in activities that did not directly benefits ourselves.   The sense of community and patriotism that was built in the months following the terrorists attacks still exists with me today.   We now volunteer regularly as a family for a number of charities.   Through the destruction of the Twin Towers, I finally understood my place and role in society.   Not as a bystander but an active and willing participant.   Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚   On September 11, 2001 many people lost their lives and I gained my independence from childhood fantasies.   Before that Thursday in September, I never thought about life and death.   I never considered the consequences of war and the denial of freedoms.   Now that I am older, I realize that September 11, 2001 was not just pivotal point for me but America itself.   Not since Pearl Harbor had the United States been unexpectedly attacked on it’s own land.  Ã‚   Just as families pulled together so did the United States as a whole.  Ã‚   We cried together and we healed together.  Ã‚   To actually witness the attacks was life changing but to be part of the healing process was life affirming. Bibliograhy Berne, S. (2004). Ground Zero. In S. Mandell, and Kirszner, L. (Eds.), Patterns for College Writing: A   Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚   Rhetorical Reader and Guide (pp. 158-161). New York, NY: St. Martin’s Press.

Seven Personal Qualities Found in a Good Leader

How often have you heard the comment, â€Å"He or she is a born leader?† There are certain characteristics found in some people that seem to naturally put them in a position where they're looked up to as a leader. Whether in fact a person is born a leader or develops skills and abilities to become a leader is open for debate. There are some clear characteristics that are found in good leaders. These qualities can be developed or may be naturally part of their personality. Let us explore them further. 1. A good leader has an exemplary character. It is of utmost importance that a leader is trustworthy to lead others. A leader needs to be trusted and be known to live their life with honestly and integrity. A good leader â€Å"walks the talk† and in doing so earns the right to have responsibility for others. True authority is born from respect for the good character and trustworthiness of the person who leads. 2. A good leader is enthusiastic about their work or cause and also about their role as leader. People will respond more openly to a person of passion and dedication. Leaders need to be able to be a source of inspiration, and be a motivator towards the required action or cause. Although the responsibilities and roles of a leader may be different, the leader needs to be seen to be part of the team working towards the goal. This kind of leader will not be afraid to roll up their sleeves and get dirty. 3. A good leader is confident. In order to lead and set direction a leader needs to appear confident as a person and in the leadership role. Such a person inspires confidence in others and draws out the trust and best efforts of the team to complete the task well. A leader who conveys confidence towards the proposed objective inspires the best effort from team members. 4. A leader also needs to function in an orderly and purposeful manner in situations of uncertainty. People look to the leader during times of uncertainty and unfamiliarity and find reassurance and security when the leader portrays confidence and a positive demeanor. 5. Good leaders are tolerant of ambiguity and remain calm, composed and steadfast to the main purpose. Storms, emotions, and crises come and go and a good leader takes these as part of the journey and keeps a cool head. 6. A good leader, as well as keeping the main goal in focus, is able to think analytically. Not only does a good leader view a situation as a whole, but is able to break it down into sub parts for closer inspection. While keeping the goal in view, a good leader can break it down into manageable steps and make progress towards it. 7. A good leader is committed to excellence. Second best does not lead to success. The good leader not only maintains high standards, but also is proactive in raising the bar in order to achieve excellence in all areas. These seven personal characteristics are foundational to good leadership. Some characteristics may be more naturally present in the personality of a leader. However, each of these characteristics can also be developed and strengthened. A good leader whether they naturally possess these qualities or not, will be diligent to consistently develop and strengthen them in their leadership role.

Causes of World War I Germany Essay - 1602 Words

World War I was a war between the allies, which included Russia, France, Serbia, and Great Britain, against the central powers of Europe; Germany and Austria. When war broke out between Austria and Serbia in 1914, the alliance system drew the other European countries into the war; consequently the rest of the world was brought into the conflict. In the early twentieth century, Germany was witnessing a prospering economy alongside an increased sense of national pride. With the growing economy, Germany began to make progress in the Arms Race and in the development of their navy. Under the control of William II, Germany made a series of unlawful decisions that added to the animosity between European superpowers. With the introduction of†¦show more content†¦As stated by Suzanne Karpilovsky, â€Å"The standing armies of France and Germany doubled in size between 1870 and 1914.† (Karpilovsky, Fogel and Kobelt). In this way, Germany’s rapidly growing military expendi ture made other European countries feel insecure about their safety. Great Britain had its own insecurities regarding Germany; in particular Great Britain’s â€Å"Balance of Power† policy was being disrupted as Germany’s military strength was making Germany the most powerful country in Europe. This led to increased feelings of tension between Germany and other European powers; as Henry Kissinger stated, â€Å"Germany became the strongest and as such proved disquieting to its neighbors.† (Kissinger 169). This is why Germany’s immense progression in the arms race during the early 20th century can be seen as a factor in causing World War I. During the early 20th century, Germany was well on its way to being one of the most powerful nations in the world. With a large land army and an expanding naval fleet, Germany was starting to gain the confidence it needed to go out andShow MoreRelatedGermany and Cause of World War I Essay903 Words   |  4 Page sGermany and Cause of World War I In 1914, World War 1 broke out between six main countries. These were Britain, France, Russia, Germany, Austria-Hungary and Italy. The murder of Archduke Franz Ferdinand was what triggered off the war but I am here to discuss how there was a lot more to it than the murder of just one man. Germany did not cause the war alone, as will soon come clear. Germany felt encircled, as there was a strong friendship between Russia to the eastRead MoreEssay about Did Germany Cause World War I1401 Words   |  6 Pages Did Germany cause World War 1? nbsp;nbsp;nbsp;nbsp;nbsp;Although in the Treaty of Versailles Germany was to accept full responsibility for World War 1 this in not necessarily the case. 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