Identify and fully describe the main developments Essay Example for Free

Identify and fully describe the main developments Essay 1. Identify and fully describe the main developments of Operating Systems, giving examples of their origins and use. Batch Operating Systems were an early operating system available, and were first introduced in the mid 50s. They were designed to make human manual work easier; humans were replicating identical jobs over and over again, hence in batch. A batch operating system keeps itself eventful; it does this by taking jobs from a batch queue, instead of waiting for people to submit jobs. The jobs are then processed one or more at a time under control of the operating system, however most jobs undertaken in this operating system would be single-task. These type of operating system were often left to work overnight, mainly because the jobs were batched the next job in the queue would be commenced as soon as the previous job had been completed, this way of processing would allow for a large work load to be automatically completed without the requirement to wait and tell the computer to do the next job. Real Time Operating Systems (RTOS) are often embedded, meaning a integral part of a system inside another device. They have very little user interface capability. Real time operating systems like their name implies, respond to an input immediately. Real time operating systems are capable of processing data so quickly that the results are available to influence the activity currently taking place. [Computer Science 5th Edition, CS French, Ashford Press Gosport, 1996] Real time operating systems guarantee a certain capability within a specified time constraint; these time constraints are usually very rigid. If the system does not conform to this time limit, the system ultimately fails. They are used for various purposes; a few of these are medical equipment, industrial control systems and car computers. Parallel Systems have more than one processor to carry out a single job. The systems often carry out one single job using the resources of both processors of the machine; however some systems will have a processor dedicated to a single task. These operations work in parallel (side by side) of one another. Distributed Systems act as an illusion to a user. A multiple number of nodes are set up on a network, to allow data access or device sharing. This allows for other users of different machines to access data on another machine on the network. For example at college a student logs on to the machine, the machine seems local to the user, the user observes the system as using its own local drives and devices. However these Drives and devices are setup on a client-server machine but appear to be local to the user. Time Sharing Operating Systems allow multi-tasking, the operating system shares a slice of the processor resources to designated programs and users logged on to the system. For example, it is not unusual for a home user to have a word processing package, internet browser and a multimedia package to be open at the same time. Microsoft Windows is a great example for allowing this. Personal Computer Operating Systems were brought about in the early 70s. However it wasnt until the 1980s that they became popular, and the focus of the operating system changed from the hardware aspect, to that of the user interface (how the user observes the operating system). Personal Computer Systems are simply operating systems that share the processors resources for single users tasks. The main concept behind personal computer operating systems is the user interface. The workings are important; however the main principal is that the user is entirely interactive with the system. These are perhaps the most difficult for designers to produce, as a very high level knowledge of user interface design is required. This is to allow users of any level to use the system comfortably. It allows for considerable power for a single user to run high-tech graphics and multimedia packages. These operating systems evolved in to very capable systems, allowing for heavy multi-tasking usage. Examples of Personal Computer operating systems are as follows: Microsoft Windows Linux Apple Macintosh MAC OS 2. Identify and fully describe the main purposes of an operating system. All components of the operating system are required to be covered, to clearly show an understanding of what each component does and how they fit into the overall system design. Process Management Process management is a way of tracking processes and managing them in such a way that there is enough processor resources to correctly function. Process is another word for a task that is to be performed by the computer. Along with a process is a set of information about the particular process. The information required to track these processes are stored in a data package called a Process Control Block (PCB). The process control block contains the following information about a process:   An identification number that uniquely identifies the process Owner ID An identification of the user/device who the process belongs to   Priority A number to represent its priority to the system   Status What its current state is. This is 1 of 3 states (Ready, Waiting, Running). Units of Processor Time Used   Resources waiting for for example paper for the printer.   Link to Another PCB   Registers the registers the process has contents in. Process ID 239845 Owner ID Chris. Oliver Priority 25 Status Waiting Units of Processor Time Used 264 Resource waiting for Disks [printer] Link to another PCB Next PCB in wait Queue Registers Contents of registers when process last stopped running An example of a PCB is shown below: this is for a print job A Processes state is diagrammatically shown below, this shows state transition and how it works. A process can be in one of five states; these five states are as follows: State Definition HOLD A processs state at the beginning, this is when the devices and memory allocation size is decided. READY this state is when the process has been allocated all the resources required and is ready for being operated on by the computer RUNNING This state is when the process is in the CPU WAITING This is when the process stops because of an input or output waiting to be completed. The process is removed from the processor and is allocated this state. It is given this state until the input or output is given the all clear. FINISHED This is when the process has been finished, and all the devices used by the process have been released ready for the next process. Deadlocks Deadlocks occur when a multiple number of processes fight for very little resources available from the processor. For example one process has been granted the allocation of the modem, however is waiting for a text file, but process two has the text file and is waiting for the modem. In this instance each process will not gather the resources required because they have been allocated to another process, this is where a deadlock occurs. Process Management in an operating system has the job to destroy one of the processes to allow for one of the processes to be put in the ready queue. Scheduling Scheduling is a method in the operating system that allows processes to enter the ready queue allowing them to then take execution. The strategies used to take these processes and allow them to be ready for execution are as follows:   Process the maximum amount of jobs.   Sharing out processing time equally to users   Providing acceptable response times, this is in the form of not running intensive programs while users are logged on to the system. Keeping devices as busy as possible.   Attempting to gradually freeing up of processes, instead of crashing.   Avoid Deadlocking Scheduling is comprised of three sections: 1 Long Term Scheduling this is where processes are batched together, when the resources and space are free the process is then executed. This type of scheduling is used for jobs like heavy overnight print jobs. 2 Mid-Term Scheduling this is where a decision is made as to whether the processor is to busy for the amount of processes attempting to use it, the decision can be then fixed by terminating processes. When the system is free again the process can be re-executed. 3 Short Term Scheduling is a where the next process is selected from the ready queue; it uses algorithms to do this. Shortest burst time being the time spent running before the process will have to wait before an input or output operation. Shortest remaining time is the processes that have very little time left; this inevitably allows space for another process to execute. Priority scheduling a control that allow special circumstance processes to execute through the system quickly. Round robin limits the time a process is allowed to run before it is removed, it is then placed back in the ready queue. Memory Management Memory is an area in which data and instructions are stored. These operations must be managed by an operating system in order for the system to be stable and to run fluently. Memory management within an operating system must ensure that a process has enough memory to run, ensuring it does not go in to another processes slot as this causes corruption. This management is a way of protecting memory from becoming unstable. Memory management is also responsible for using the computers other memory sources effectively, to ensure programs run smoothly and effectively. This is handled by using virtual memory; using the hard disc drive as a temporary memory source for processes and data. This can benefit the user in various ways: The user is not rigidly restricted to space available. Using a large virtual memory space provides convenience for instances where large programs etc. are required to be stored in memory. Users are using less physical memory; therefore the system can handle more users on the system. High Speed Cache is a fast memory storage; cache predicts the data that the CPU may need next, it then retrieves it from RAM and places it in to the high speed cache, this speeds up system performance, as cache is a lot faster than RAM is in providing for the processor. The operating systems task is to control an even flow of the processes and decide where they should go practically, moving processes to the best location as the scheduler asks it to do so. This scheduler knows what process is next in line therefore can tell memory it is next and to move it to a suitable location for it to be quickly accessed. Paging Paging is a method used in operating systems to make a programs memory non-contiguous, in simple terms; allowing a program to be allocated to any memory location available. This is used when a bulk of data is bigger than the memory allocation it has been given; it firstly fills the memory allocation provided, and then stores the rest of the data in any space available in memory. This method of splitting the data is known as Fragmentation. This decreases system performance. Defragmentation To enhance the performance of the memory of a secondary storage medium, the operating system runs an operation called Defragmentation. Defragmentation is a process that sorts data in to a contiguous sequence. If a non-contiguous set of data is found, it will be relocated and stored as a whole. The image above is an illustration to show pictorially how a storage device could look in a data structure. As you can see fragmented files are scattered. If this data was attempted to be retrieved it would be slower feedback to the user as the data has been fragmented and would have to be found first. If data is to be found quickly and retrieved without a problem, the diagram below shows how a data structure should pictorially look. The image shows a contiguous data structure, with no fragmented files. This is the idea state for a system to be operated under. File and Disk Management TALK ABOUT HOW MEMORY IS STORED i. e. CONTIGIOUS Blocks of data are assigned in a complete row, using this method the files are simple to access. The space must be large enough to store all the data Files may become larger, therefore the space may be too small in the future, then it will need relocating (moved) This then causes fragmentation of the storage device. , NON CONTIGIOUS Files are recognised by operating systems and worked upon by using file extensions. A file consist of two parts, one being the unique name to the user, second being the file extension related to the program that runs that type of file. The operating system recognises exactly which program to open when the file is run. The way that files and data are managed, is critical to the performance of the computer and the security of the data. File management within an operating system provides a logical way for the user to observe there data, instead of having the complication of the physical implementation. Operating systems main job in this area is to ensure that data is stored and relocated correctly, as well as having the responsibility to process files, find space to store them, and to retrieve this data at any time. For example a . PDF file when run will be recognised by the operating system to be open in Adobe Acrobat Reader, providing the program is installed on the computer. An operating system can perform several different tasks towards files, they are as follows: Operation/Task Function Create finding space for it on storage medium, a new record made in directory Write Finds the file from directory and adds data to it. Read Finds the file then puts it in to memory and a read pointer is used to track where the next read place is to take place. In most operating systems however, a write pointer is held at this point, in-case the user intends to write to the file while reading Delete finds the file, then frees all space given to it, this is then erased from the computer Files are a collection of saved information that is stored on a type of storage medium for later retrieval. File attributes are the information related to the file, just like we have information related to ourselves, i. e. telephone number and home address. A files attributes are vital in order for the operating system to create a file structure system, it does this by using the attributes to sort the files in to some kind of order. For computer data files there are a set of minimum attributes related to them, they are as follows: Attribute Name Role Name an identifier to the user, in the form of a string of characters Type the type of file it is, this is important as different operating systems handle different types of files differently. Location Information held about where the file is stored, usually in the form of a path to it. e. g. C:\Documents and Settings\Chris\Assignment. doc. Size The size of the file (in bytes) e. g. 270kb. Protection Permissions to who can access the file. I. e. Read Only Date when the file was created, modified or accessed. Author the person the file was created and saved by. Directories Directories are a hierarchical way of separating these files; directories simply make it simpler for users to relocate the file at another time. The root is the top directory of a file system; the root is determined by the operating system. The root directory is usually the bootable device on a home computer system. Commonly C: Paths are a list of directories that the operating system goes through to find a run able file. For example: C:\windows\cdplayer. exe The operating system will go in to the root and then in to the directory Windows the file named cdplayer. exe will then be located and executed. Tree Structure are of a hierarchical nature, therefore the top level is the root of the directory and every other sub directory from which all other directories stem off. A Backslash is used to separate and indicate directories within directories (sub directories) Directories allow a method for the operating system to easy locate files. Volumes are a fixed amount of storage space allocated on a device. If a hard disc drive has two partitions set up, then it is said to have two volumes because it has two separate fixed storage spaces. Formatting a device in turn means to prepare it for read and write access. It does this by wiping all drive information that has been pre-set, it then tests each sector of the disc to ensure they are reliable enough for read and writing in and out of. File Allocation Techniques FAT (File Allocation Table) 32. Located on the storage device, basically holds the relevant information in a table, to find the data on the disk. its security does not measure up to that of NTFS and its filename size constraint is poor to that of NTFS. Searches from top to bottom when looking for a file. Contains the first block of each file on the disk, Requires a tremendous amount of space NTFS (New Technology File System) Used in Windows NT based operating systems Uses a similar table to that of FAT32 to keep track of file locations Looks at directory structure from the side to help speed up the location of files Uses Link Listed Allocation. Linked allocation creates inked lists using disk sectors as nodes. For example, if the sector size is 512 bytes, and it takes a 32 bit number to represent the next block address, then only 508 bytes can be used to store data (the other 4 bytes are used to locate the next file sector). This approach eliminates external fragmentation (since even the smallest block can now be used). Some problems with this approach are that seeking within a file is now difficult. For example, if were interested in the last 100 bytes of a 100mb file, we need to traverse all the sectors of the file (follow links) to get to the last 100 bytes. Another major issue is that we need to do a disk seek with every disk sector (unless disk sectors are contiguous). And yet another issue with this is that storing pointers on every disk sector uses up a lot of disk space. UNIX Used I-Nodes an indexed file allocation method. Its fast for small blocks of data and can accommodate extremely large volumes of data RAM Disk RAM disks are a temporary storage solution, data cannot be permanently saved, and data is lost on any type of system shut off. I. e. system reboots. A Random Access Memory disk is a segment of the main memory that is left for extra storage if required. This is otherwise known as a Virtual Drive. The main use for this area is that of performing operations to files, this is a better way of performing operations as the rate at which they can be performed on are that much higher than that of a physical drive. Size constraints are a major problem with RAM disks, as they are limited to that only of the RAM contained in the machine. For example in modern home computer systems 256mb of RAM is contained, therefore only 256megabyte of RAM disc can be used. 256mb in todays computing is very little in comparison to what users require. OS Services files, copy, delete, rename, view, find, backup Directories create, rename, list, delete Programming, Open, close, read, write, seek File allocation methods, FAT 32, NTFS, UNIX, Disk caching RAM disk Defragmentation I/O System Management DMA DMA takes control of the system by imitating the processor; it does this to enable itself to transfer data to and from the memory using the system bus. Buffering is required primarily because of the slow nature of I/O Device function. It is a way of smoothing out an I/O operation, Virtual Segmentation each process is divided in to slices (segments) non-resident Caching and Spooling of Input and output devices Drivers System Components ( CPU, RAM, System Bus, Local Buses, Device Controllers, Control Registers, Devices). IO response System (polling, interrupts, I/O, DMA Kernal Layers, Purpose, Device, Drivers, System calls Device Management Device management controls hardware resources; this includes the control over selection and operation of the devices used for input, output or storage. 2. Select an appropriate type of operating system for the following ICT needs, giving the choice of current operating systems [trade names]: a) Local council office department in charge of the collection, and distribution of council tax. b) A national car-rental agency, whose main computing centre is located in Sheffield, through which all of the daily transactions for the business are conducted. c) An electro-plating circuit board manufactures. d) A travelling company representative, who uses technology to keep in touch with his office. 3. Research and identify the different operating systems currently available for desktop computers. From your research and investigations of these operating systems you must critically evaluate them. This evaluation should clearly demonstrate your understanding of the differences found including and potential disadvantages. Bibliography http://www. cse. lehigh. edu/~glennb/um/book/c10os. htm http://dragon. acadiau. ca/~dbenoit/3713/slides/pdf/Week2. 1_History. pdf http://cne. gmu. edu/itcore/processes/Time. html http://www. netnam. vn/unescocourse/os/35. htm#3. 5. 3%20Virtual%20memory%20concept http://www. cs. aue. auc. dk/~akbar/ospdfiles/wschap7. PDF Books [Computer Science 5th Edition, CS French, Ashford Press Gosport, 1996].

Abortion Essay Example for Free

Abortion Essay Lucinda Seongbae Eng : Persuasive essay on abortion Prof. Fitzgerald A Positive View on Pro Abortion Abortion has been a controversy for many years and viewed in many different perspectives. Some individuals see it from a very positive point when this is being caused by the nature of the womans health, the age and others. It may also be seen as a way of getting rid of an unwanted or accidental pregnancy for reasons that are positive and beneficial for most women. According to feminist perspectives on reproduction and the family, in some cases abortion can be a positive act depending on the cause. For instance, in the case of a rape, health reasons or in the case of having an unwanted child for reasons of age, marital status, and economical reasons abortion is a potent tool to undo some mistakes. However, whichever ways it is perceived abortion gives a woman the right to choose and should not be viewed as a negative act but instead can be seen as a positive act in most circumstances. Based on the many positive reasons for abortion, abortion should be supported. Concerning the womans health an abortion can be performed when the woman cannot hold the fetus for health reasons. For example a woman who has AIDs and the fetus infected already can obtain an abortion because there is no life for the baby. Also a woman who has cancer at an advanced stage cannot keep a child in her womb or she will risk dying at birth. In the case of some diseases, kidney disease, severe hypertension, sickle-cell anemia, severe diabetes, etc that can be life threatening, an abortion often helps to avoid serious medical complications from childbirth. This also brings emphasis to Roe V. Wade (1973), which granted women the right to terminate an unwanted pregnancy, based on an implicit fundamental right to privacy and argued that it must be weighed against competing state interests in maternal safety and the protection of prenatal life; it protected this right during the first trimester of pregnancy (Thompson, 50). At this juncture the person has very good justifications of her action and is considered a positive act on her part. Another positive issue concerning abortion is a situation where girls below fifteen years are pregnant. In such situation abortion is possible because the girls are too young for child bearing. Also in situations where very young girls have little or no health facilities to ensure safe delivery, such as in developing countries, abortion is the only possible answer in order to avoid some major complication. According to researcher Mayor, complications from pregnancy and childbirth are the leading cause of death in young women aged fifteen to nineteen in developing countries. An estimated 70,000 adolescent mothers die each year because they have children before they are physically ready for parenthood, and more than 90% of these births are in developing countries the report says (www. bmjjournals. com). In this case, if a girl of these ages chooses to get an abortion to avoid complications of childbirth and/or death she is only making a positive decision for her life. According to those against abortion or those who perceive abortion as a negative act, one would argue that since life begins at conception, abortion is akin to murder as it is the act of taking human life. Abortion is in direct defiance of the commonly accepted idea of the sanctity of human life. In contrary, most abortions take place in the first trimester, when a fetus cannot exist independent of the mother. As it is attached by the placenta and umbilical cord, its health is dependent on her health, and cannot be regarded as a separate entity as it cannot exist outside her womb. Therefore, in this case abortion cannot be considered murder. According to Thomson (1971), â€Å"if women have rights over their own bodies, then they have rights not to have their bodies used by others against their will† (Thompson, 35-65). Therefore, even if it is argued that the fetus is a human life, the state has no right to force someone to donate use of their body to another person, even if that person is in extreme need. Another may argue that those who choose abortions are often minors or young women with insufficient life experience to understand fully what they are doing. Many have lifelong regrets afterwards. In defense to that, teenagers who become mothers have grim prospects for the future. They are much more likely to leave school; receive inadequate prenatal care; rely on public ssistance to raise a child; develop health problems; or end up divorced. Teenage births are associated with lower annual income for the mother. According to researcher Stanley, eighty percent of teen mothers must rely on welfare at some point. Teenage mothers are more likely to drop out of school. Only about one-third of teen mothers obtain a high school diploma. Teenage pregnancies are associated with increased rates of alcohol a nd substance abuse, and lower educational level (www. womenshealthchannel. com/teenpregnacy. index). In the modern world, abortions have become a norm of life and should not be looked upon as a negative act but an act of making a positive decision to undo some mistakes in life. Though women have been endowed with the gift of bearing a life form, an abortion gives them the option of whether they want to keep the present or not. However, an abortion should not be misunderstood for a convenience, as it does have its own advantages and disadvantages. The bigger picture that is being stressed is bodily integrity and self-ownership.

Electrical Detection Of Liquid Lithium Leaks from Pipe Joint

Electrical Detection Of Liquid Lithium Leaks from Pipe Joint Contents (Jump to) 1.0 Introduction 2.0 Theory Of Operation 3.0 Hardware and Electrical Circuit 4.0 Result from Test Circuit 5.0 Summary 1.0 Introduction Liquid lithium is a candidate plasma facing component (PFC) material for a fusion reactor, and lithium PFCs have been shown to improve plasma confinement and reduce impurities in tokamaks such as TFTR, 1 CDX-U, 2 NSTX,3, 4 FTU,5 and HT-7.6 In a reactor, the liquid lithium would have to be circulated in a loop system for power handling and the removal of impurities including tritium. A circulating system is more complicated than the static configurations used to date in fusion devices, and so requires further development and testing: for example, in a liquid lithium system, the ability of a system to safely freeze, re-liquefy, and then continue operation without leaks is essential. The Liquid Lithium Test Stand (LLTS) is being constructed at Plasma Physics Laboratory (PPL) to gain experience with flowing lithium systems, and as a prototype for circulating lithium in future PFC test modules. The LLTS consists of an upper and lower reservoir, a rotating permanent magnet pump, and an electromagnetic flow meter. The top of the reservoirs are kept under vacuum. The LLTS is designed to operate at up to 500 à ¢- ¦C and contain up to 2 l of lithium. Connections of the pipe to the reservoirs are welded, but all other joints are demountable VCR fittings to ease construction, maintenance, and reconfiguration of the loop. Compared to a weld, a demountable joint is more likely to leak, which is a major safety concern since liquid lithium is hot (over 200 à ¢- ¦C) and reacts with atmospheric gases, water, and concrete. The LLTS therefore requires a design to minimize the impact of potential leaks, including a system to detect leaks and actuate control systems. 2.0 Theory of Operation We monitor for leaks of liquid lithium from a pipe joint by using the conductivity of the leaking liquid metal to complete a circuit. Liquid lithium at 400 à ¢- ¦C has a resistivity9 of 32 ÃŽ ¼ cm, roughly three times less than that of 316 stainless steel at the same temperature, 10 102 ÃŽ ¼ cm. A conducting shell, normally electrically isolated from the pipe, surrounds each VCR fitting. If lithium leaks it will contact the shell, which will no longer be electrically isolated from the pipe. A circuit monitors for continuity between the pipe and the shell. If continuity is detected, the control systems are actuated: power to the heaters and pump motor is turned off so that the lithium in the loop can cool down and solidify. 3.0 Hardware and Electrical Circuit The loop is constructed from 316 stainless steel, which is resistant to corrosion by liquid lithium. The pipe of the loop has a 3/8 in. diameter and pipe joints are 5/8 in. Swages lock VCR fittings, with special non-silver-coated stainless steel gaskets. Each VCR fitting is surrounded by a 0.050 in. thick cylindrical copper shell, electrically isolated from the pipe by Cotronics Ultra Temp 390 ceramic tape. A mockup of the shell around VCR fittings is shown in Figure 1. The ends of the cylinders are attached to the body by a temperature compatible braze. The shell is cut in half so that it can be positioned around the fitting. The two halves then are fastened in place by a metal band. A wire lug for the leak detector circuit is attached by a tapped hole on one cylinder end face. While copper readily alloys with lithium, it was chosen as the shell material because of its high thermal diffusivity. The shells will not be thermally insulated as the pipes will, so they will be cooler than the liquid lithium inside the pipe. If lithium leaks out of a VCR fitting, it will be physically contained by the shell and cooled down by the copper acting as a heat sink. The combination of alloying and lower temperature reduces reactivity. On this principle, copper powder fire extinguishers for lithium fires were developed.11 In order to prevent lithium from reacting with air, and that which might leak from the shells from contacting the concrete floor, the loop will be surrounded by an argon-filled stainless steel enclosure which includes a floor plate with walls sufficiently high to contain the entire inventory of liquid lithium. An electrical circuit, shown in Figure 2, monitors for continuity between the copper shell and the pipe. The inputs to the circuit are the two lea ds in the lower left of the figure: the upper lead is attached to a copper shell, and the lower (ground) lead is attached to the loop. Normally, the â€Å"+† input of the comparator is pulled up above the â€Å"–† Comparator Reference Voltage by a 100 k resistor attached to a 5 V supply. If there is a fault in the loop such as a leak of lithium or a physical contact between some part of the copper shell and the pipe that allows current to flow from the upper lead to ground, the â€Å"+† input of the comparator is pulled below the reference voltage. This causes the comparator to output 0 V and the relay latches off the power to the heaters and pump. A fault draws current through the 100 k pull up resistor and also through a front panel LED, which lights. FIG. 1. One channel of the interlock circuit. If there is a fault (such as a leak) that causes the open circuit at left to be shorted, the â€Å"+† input of the comparator will be pulled down, the comparator will output 0 V, and the relay will open, latching off the power to the heaters and pump. FIG. 2. Block diagram of the interlock system for the heaters and pump motor. If the leak detector circuit detects a fault, or the E-stop button is pushed, power to the pump motor and heaters will be turned off until the leak detectors register no fault on all channels and the start button is pushed. â€Å"MC† is the motor controller and â€Å"SSR† is the solid state relays. In order to ensure that it is easy to identify the location of a fault, for each channel there is an analog LED on a front panel display that will light up in case of a fault. One additional normally-on LED for each board shows that the interlock system itself is powered on. The fault status of each channel in the interlock system is monitored and recorded by a PC with lab VIEW. The digital output of the comparator for each channel is sent to a SCB- 68A connector box which is attached to a 6323 National Instruments card in the PC. The lab VIEW program polls each interlock channel at 1 kHz, in order to record intermittent faults. Each channel has two displays in lab VIEW: one for its present status, and one indicating whether there has ever been a fault in the time since a â€Å"reset† was clicked. Since the analog front panel display shows the present status, this lab VIEW display would allow an operator to see where a past fault occurred. Additionally, for ease of monitoring, a schematic of the loop shows the status of each leak detector in its proper location. Every second, for each channel, the program logs to a file whether there has been any fault during that 1 s period. Along with thermocouple and pressure data in the same file, this could aid in reconstruction of the circumstances surrounding a fault. Note that the PC with Lab VIEW is for monitoring and logging only, and it is not at present part of any control loop. 4.0 Result from Test Circuit The electrical systems described were constructed. The open-circuit voltage between the sensing terminals was 3.5 V, and the short-circuit current (limited by the 220 resistor) was 15 mA. The reference voltage potentiometers were adjusted for maximum sensitivity so that any resistance between the sensing terminals of less than 2 k triggers the interlock. A test of the interlock system was performed in air with gallium as a surrogate liquid metal. Gallium was poured into a section of pipe with a VCR fitting gasket that was intentionally damaged by cutting a small slit. As expected, gallium leaked out from the damaged gasket, contacted the copper shell, and triggered the interlock. 5.0 Summary The resistance of a liquid lithium leak should be much less than the 2 k maximum resistance to trigger the interlock: even a 1 cm long, 1 ÃŽ ¼m radius cylinder of liquid lithium between the copper shell and pipe would have a resistance of only 1 k and would trigger the interlock. The LTS will be in an argon-filled enclosure to minimize lithium reactions if leaks occur. Lithium compounds that do form with any residual gases will dissolve in the liquid lithium, 12 and should not affect its electrical conductivity in the time it takes to trigger the interlock system. One potential problem of this system is that an open circuit between the two sensing terminals is the normal condition: if one of the sensing wires were to become disconnected or be cut, that channel would cease to be able to detect a fault, but there would be no indication in the system of a problem. A testing procedure or additional system could be developed to ensure operation of all leak detector channels. Another issue is that only VCR fitting joints are monitored. A leak elsewhere in the LTS would not trigger the interlock system. It could be advantageous to have an additional non-localized leak detection system, for example, by monitoring for a sudden change in pressure in the loop. While the vacuum pressure above the reservoirs is monitored and logged, pressure readings are not at present incorporated into the interlock system. The LTS, a test stand for flowing liquid lithium and liquid lithium PFC test modules at PPL, is being constructed. A circuit to detect leaks at the demountable joints in the loop has been constructed and tested with a surrogate liquid metal, gallium. If a leak is detected, the circuit actuates a control system, latching off power to the heaters and pump in order to bring the loop to a safer state. Liquid lithium leaking from joint contacts the surrounding copper shell, completing the leak detector circuit. The copper shell helps lower the reactivity of leaking lithium b y alloying with the lithium and by acting as a heat sink.

Television : Candy For The Mind :: essays research papers

A man once said, "Televevision is candy for the mind." He was right. Making an analogy to candy is ideal ; either, if taken in excess can have a negative affect on the human. At one point or another you watched too much TV. And at one point or another you ate too much candy. Maybe it was on Halloween or Christmas...it doesn't matter. The point is that both are a treat if taken in moderation. The problem is , nowadays, too many kids are watching too much tv, and too many people are eating too much fattening items like candy. THere's more fat people waddling around and more kids believe the stereotypes that the media has provided for the ever stable database of memory in their heads. When a child is born in a society so motivated by technology and television, what other choice do they have but to watch television? The babysitters use it as a means to make their job easier (though I could not agree more in that case) parents so they can calm their kids down, and adolecsents because they want to watch something or are bored. Most of the time, people my age will watch TV because they are bored. When in doubt watch TV. The problem with the excessive viewing of TV is that it is decreasing the amount of thinking done by people ; children especially. This scares me seeing as children are easy targets ; vulnerable , impressionable, and naive, they are the ideal targets. Watching mindless shows like Power Rangers and Beavis and Butthead, children are becoming more and more unlikely to really think. Books and complicated plays make people think. Poems make people think. Television, on most occasions, does not. The reason for this being because our society is a lazy one, and a corrupt one at that.

Social Blindness Essay -- Sociology

Blinded Total darkness can take over ones’ sight, leaving the individual barely capable of forming cognitive images, and experiencing the inevitable dependency on the words of others, thus allowing physical blindness to cripple even the most independent of individuals. The phenomenon of social blindness can describe one who leans not on their own understandings, but instead on the understandings of those surrounding them, which is a trend all too common in the modern world. In â€Å"Selections from Losing Matt Shepard: Life and politics in the Aftermath of Anti-Gay Murder†, transcribed by Beth Loffreda, mass media affected the spread of the truth behind an incident and blindly lead the majority of the United States population to believe various aspects of the murder of Matt Shepard that were created by the media. The spread of unrestrained information about the murder was only possible with the assistance of today’s largest medium, the internet. In â€Å"Is Google Mak ing Us Stupid?† author, Nicholas Carr explained how modern individuals no longer check the validity or exposition of a source, but â€Å"Power Browse† for the facts and important aspects of what they are reading. Whether the article is false or valid has little to no effect on the decision making of reader, for all they look to obtain from the text is information†¦ right or wrong. Yet, with this more efficient and immediate form of information extraction, there is a tangible loss of deep reading and the ability to â€Å"See.† In â€Å"The Mind’s Eye: What the Blind See† the author, Oliver Sacks, gave a few accounts of individuals who were blind in the common meaning of the word that could â€Å"See† more than most individuals that had a fully functioning optical mechanism. Today’s society conta... ...ess, a slow, almost prehensile attention, a sensuous, intimate being at one with the world which sight, with its quick, flicking, facile quality, continually distracts us from,† (Sacks 313). It has been stated that throughout one’s life they maintain a malleable brain that can adapt to multiple situations, which in this case blindness. At the onset of blindness, the brain begins to rewire itself by spreading into the areas of optical stimulation and the brain manipulates them to aide with the expansion of the other senses. The rewiring of the brain accounts for the blind being known as â€Å"Whole-Body Seers,† since the senses of their body’s have matured more than normal in the absence of visual stimulation. As â€Å"Whole-Body Seers,† the blind claim to be sensitive to inflections in the pitch of others voices that show signs of emotions not present to the ordinary eye. Social Blindness Essay -- Sociology Blinded Total darkness can take over ones’ sight, leaving the individual barely capable of forming cognitive images, and experiencing the inevitable dependency on the words of others, thus allowing physical blindness to cripple even the most independent of individuals. The phenomenon of social blindness can describe one who leans not on their own understandings, but instead on the understandings of those surrounding them, which is a trend all too common in the modern world. In â€Å"Selections from Losing Matt Shepard: Life and politics in the Aftermath of Anti-Gay Murder†, transcribed by Beth Loffreda, mass media affected the spread of the truth behind an incident and blindly lead the majority of the United States population to believe various aspects of the murder of Matt Shepard that were created by the media. The spread of unrestrained information about the murder was only possible with the assistance of today’s largest medium, the internet. In â€Å"Is Google Mak ing Us Stupid?† author, Nicholas Carr explained how modern individuals no longer check the validity or exposition of a source, but â€Å"Power Browse† for the facts and important aspects of what they are reading. Whether the article is false or valid has little to no effect on the decision making of reader, for all they look to obtain from the text is information†¦ right or wrong. Yet, with this more efficient and immediate form of information extraction, there is a tangible loss of deep reading and the ability to â€Å"See.† In â€Å"The Mind’s Eye: What the Blind See† the author, Oliver Sacks, gave a few accounts of individuals who were blind in the common meaning of the word that could â€Å"See† more than most individuals that had a fully functioning optical mechanism. Today’s society conta... ...ess, a slow, almost prehensile attention, a sensuous, intimate being at one with the world which sight, with its quick, flicking, facile quality, continually distracts us from,† (Sacks 313). It has been stated that throughout one’s life they maintain a malleable brain that can adapt to multiple situations, which in this case blindness. At the onset of blindness, the brain begins to rewire itself by spreading into the areas of optical stimulation and the brain manipulates them to aide with the expansion of the other senses. The rewiring of the brain accounts for the blind being known as â€Å"Whole-Body Seers,† since the senses of their body’s have matured more than normal in the absence of visual stimulation. As â€Å"Whole-Body Seers,† the blind claim to be sensitive to inflections in the pitch of others voices that show signs of emotions not present to the ordinary eye.

Free Essay on Assisted Suicide and Euthanasia - To Live or not To Live :: Free Euthanasia Essay

To Live or not To Live: The Choice Is Yours "What do we mean when we say 'life'? Do we mean the continued functioning of the body? Of the brain? Or do we mean the continued experience of the human being?" (Pridonoff, pg. 73). Many doctors are now performing what is known as physician-assisted suicide, which is when a doctor sets up a machine, but the patient actually kills him or herself. Whereas, euthanasia is the act of the doctor killing the patient. There are two sides to this issue. One side is whether or not a person should be allowed to end his or her own life. The other side of the question is, "who's decision is it to end a life?" There is a difference between assisted suicide and euthanasia. The choice to have a doctor help end a terminally ill patient's life is the patients decision to make. Many people are opposed to physician-assisted suicide because of their religious beliefs. Traditional Christian beliefs are that assisted suicide violates one's natural desire to live, suicide harms other people, and life is a gift from God and God should be the only one able to take a life from a human being (Robinson, pg.2). However, there are also religious organizations that believe in physician assisted suicide. One of them is the Mainline and Liberal Christian denominations. They are pro- choice for this form of assisted suicide (Robinson, pg.7). Many of these beliefs urge followers to choose life over death, unless life is sustained by a machine (Edelheit, pg.45). Physician-assisted suicide for patients who are in a great amount of pain should not be illegal. The patients live everyday wishing they could die to end their pain. Sigmund Freud was in extraordinary pain from cancer. He whispered to his physician, "This makes no more sense." His doctor then injected him with a dose of morphine that killed him ("Assisted Suicide"). In this instance, it was best to end his life. He was in so much pain that he no longer saw any reason to live. One the other hand, the decision to end one's life should be a difficult decision and not easy to carry out ("Assisted Suicide"). Very few states have banned physician-assisted suicide. As a matter of fact, most states favor physician-assisted suicide for terminally ill patients who are expected to live less than six months (Cloud and Donnelly, pg.

Srs for Bank Management

EXPERIMENT NO: 2 AIM: To document Software Requirement Specification for Dance Academy. THEORY: 1) Introduction: 1. 1) Purpose: This document gives detailed functional and non-functional requirements for Dance Academy. The purpose of this document is that the requirements mentioned in it should be utilized by software developer to implement the system. 1. 2) Scope: This system allows the bank employee to maintain a record of all the customers who have account in the bank.With the help of this system, the employee should be in a position to search the records of a particular customer, provide him detailed account information and delete and update the customer information as and when required. 1. 3) Overview: This system provides an easy solution to the bank employee to maintain customer as well as employee records and maintaining a record of all the transactions that take place. 2) General Description: This Bank Management System replaces the conventional, traditional file and record based system with the help of which a lot of paper work will be reduced.Thus the manual work of maintaining files which are subjected to physical wear and tear can be avoided. The employee must be able to view all the information of customers such as name, account number, date of birth, gender, address, initial balance. Also it must be able to record different transactions such as withdrawal, deposit or transfer of funds from one account to another. The employee can also add new staff members to the system providing them direct access to the database and thus enabling them to provide services to the users.The employee can also change his password to follow security constraints. 3) Functional Requirements: 3. 1) Description: The identity of each customer is verified and only then changes are made to the records each customer. After proper verification, the bank employee can bring proper changes to the database as per the requirements of the user. Also the system maintains an employee database thus keeping a record of all the members of bank as well as keeping the records of the transactions which take place daily. 3. 2) Technical issues: The system should be implemented in .NET. 4) Interface Requirements: 4. 1) GUI: GUI 1: The first form provides login page for the employee. GUI 2: After successful login, there are different actions that can be performed i. e. change password, sign-out, add customer, delete customer, add details, view details etc. GUI 3: For adding customers, all the required information is taken and the submit button is selected for making corresponding changes into the database. GUI 4: Once the changes are made into the database, on clicking the view details icon, the details of the customer can be obtained.GUI 5 and 6: The details of the customer can be updated with the help of form 5. A particular customer can be removed with the help of delete customer option. GUI 7,8 and 9: These forms record the different transactions such as withdrawal, deposit, transfer. 4. 2) Hardware Interface: Hardware Interface 1: The system should be embedded in each PC of the bank and in all of its branches. 4. 3) Software Interface: Software Interface 1: Bank Management System. Software Interface 2: The staff and employee database should maintain necessary records. ) Performance Requirements: The system should work concurrently on multiple computers during the working hours of bank. The system should support 50 users. 6) Design Constraints: The system should be designed in 2 months. 7) Other Non Functional Attributes: a) Security: Each employee is provided with a user ID and password to log into the system. Only then he can manipulate the database. b) Availability: The system should be available during bank working hours. c) Maintainability: There should be a facility to add or delete customers as and when required. ) Reusability: The same system must be used in every financial year. 8) Operational Scenarios: There will be an employee data base and customer database. The employee database contains personal information of all the employees. The customer database contains personal as well as account related information. 9) Preliminary Schedule: The system has to be implemented in 2 months. CONCLUSION: Thus we have documented Software Requirement Specification for Bank Management System (BMS).