What is the main idea of this?

Hello everyone.

I have to extract the main idea of the following text, but I’m utterly confused. Take a look:

Computers are electronic machines for processing data. Data are pieces or items of information that have been proper prepared so that the machine can work with them. Processing means handling or manipulating the material that has been presented to the machine in such ways as performing calculations, classifying information or making comparisons. A computer is made of millions of electronic devices that can store the date or switch them through complex circuits with differentes functions at incredible speeds.

The collection of devices that constitute a computer are technically known as a computer system. This system consists of functional components, or parts, for input, storage, control, processing, and output. All general-purpose computer systems has these components, but their physical characteristics may vary

The main storage, control and processing components constitute the heart of the computer system. The central processing unit (CPU) has been designed by the manufacturer to control and carry out basic instructions to that particular computer. It is here that the data processing is done. The C.P.U has two components, called the control and arithmetic units. Input and output are handled by machines that are called I/O devices.

What confuses me is that I do not see a real main idea, except for the components of a computer.
So, what do you think is the main idea? (I have to underline it)

Thanks in advance

java student registration system?

The registrar’s office at your college wants your help by coding a java program that can be used to register undergraduate and postgraduate students in different courses, set their grades (when available) and print the appropriate messages. A previous unfinished study was done by the registrar’s office and had identified the main components of the program to be the following classes: class Course , class Person , class Student , your job in this Assignment is to code these classes and any other classes you find needed-using Java.
The main characteristics of a course are the course name, course code, number of credit hours, current number of registered students, and maximum number of students that can enroll in this course.
Some of the basic operations that need to be performed on an object of the type course are:
?

:
A. Setting all the course information using one method(public void setInfo(…))
B. Print the course information when an object is printed. (override the toString()method)
C. Copy the information of another course object to this object (public void copyCourseInfo(…))
Add any other variables/methods/constructors you think appropriate
Every student is a person, class person encapsulates the concept of a generic person, a person has a first name and a last name.
Two type of students exist, undergraduate student and postgraduate student The main characteristics of a student are the student name, student registration number, number of courses in which the student is enrolled, tuition rate(storing the fees per credit), courses in which the student is enrolled(stored as course[]), and the grades for each courses(stored as char[]).
Class student includes a boolean member (isTuitionPaid) to indicate whether the student has paid the tuition. The student can enroll in a maximum of 6 curses, however a postgraduate student can enroll in a maximum of 4 courses, also a postgraduate student pas 150L.E. more than the tuition rate of an undergraduate student.
Class Student has an appropriate Constructor for variables initialization.
The basic operations to be performed on object of type student are as follows:-
1. Setting all the student information using one method(public void setInfo(…)).
2. Register a student in a course; public Boolean registerCourse(Course course)): this method return true if the registration is successful, when a course is registered its grade is written as ‘U’ in the grades array.
3. Set the student grade of a Course using the method ( public Boolean setGrade(Course course, char grade))
(Overload this method with another method that receive the index of the course in the array and the grade and another method that receives the course code and the grade.) ,setGrade returns true if the student is actually registered in this course.
4. Accessing the grade of a certain course based on its index in array(public char getGrade(int i))
(Overload this method with another method that receive the code of the course).
5. Accessing a course based on its index in array (public Course getCourse(int i)
6. Calculate the total number of credit hours taken by summing the credits of all enrolled courses.(public int getHoursEnrolled())).
7. Calculate the billing amount by multiplying the total number of credit hours taken by the tuition rate .(public double getBillingAmount()))
8. Print the student information when an object is printed.(Override the toString()method)
9. Calculate the GPA (public double getGpa())
GPA is calculated by dividing the total amount of grade points earned by the total amount of credit hours attempted.
we assume that?per credit? the grade A is equivalent to 4 points, B is equivalent to 3 points, C is equivalent to 2 points,
D is equivalent to 1 point and F is equivalent to 0 points.
Add any other variables/methods/constructors you think appropriate
Notes:?
• Add any other classes you think appropriate.
• Test your code using a separate class.

Immunobiology – complement cascade?

Can someone give me some information on the main components and effector actions of the complement system? I’m looking in my textbook but it’s not making sense, and hoping a fresh perspective will be beneficial. thanks

can anyone check my english grammar?

1.2Problem Statement

Surface current is one of the important ocean information and the main component of the ocean circulation. By studying them, it will help scientist to understand their mechanism and time-variable characters, which useful for exploiting ocean resources, disaster prevention and mitigation, ship navigation and etc (Zhang, 20007). However, this aspect has not received enough attention in the region, due to various reasons and constraints. There are two weak points in ocean current study in Malaysia which encourage this study; limitation of data collection and data management problem. Besides of that, the ability of multi-mission satellite altimetry to provide long term sea level and wind data also motivate this study to understand further the seasonal variation of surface current pattern. It is because, the transitions of monsoon which can be distinguish based on the changes in the wind flow patterns, strongly influence the surface current pattern especially at open sea area such as South China Sea.

1.2.1Data collection

Generally, basic observations of ocean current do exist in Malaysia based on in situ observational such as ship drift, drifting buoy or current metre. But in most cases, observations just cover limited areas and serve certain specific purpose. It is because direct measurement for large scale area is difficult and use costly basin scales. In Malaysia, there are two agencies which are responsible in carrying out the periodic observation on ocean current; Royal Malaysia Navy Hydrographical Department (RMNHD) and Malaysian Meteorological Department (MMD). However, as military agencies, the observation by RMNHD just most designed for military purpose and the data from the observations are not freely accessed by civilians. While, MMD just depends on four stations, Pangkor Island waters, Jetty of UMS, Kota Kinabalu, Mabul Island Semporna and Perhentian Island, Terengganu to collect the ocean current data. The observation can only provide point base data and not represent the offshore area because the stations just installed at coastal area. Thus, this limited information reveals some important features of the ocean circulation. An alternative to overcome those limitations is by using space-based technique to provide large-scale surface current and study the ocean circulation.

1.2.2Data management

Malaysia is still facing problems with ocean data management. The ocean database in Malaysia can be said as not centralised because the data are normally kept separately in the different institution which carried out the observations. For example, RMNHD and MMD have their own database system. Other industries like oil and gas have also conducted ocean current observation and have developed their own database system. Additionally, the data are not representative for the whole Malaysian seas area and are just designed for their purpose respectively. Although there is effort by the Malaysian National Oceanography Directorate (NOD) to develop MyNODC (Malaysia Oceanographic Data Centre), a database for oceanographic data sharing, but until now the project is still not fully success because of data limitation and data sharing problem between institution and NOD. This situation make difficult for scientist to access the data for another scientific research. To overcome this problem, an oceanographic database based on altimetry technology can be developed as an alternative database or supporting to MyNODC. From the database system, ocean data can be freely extracted, analyzed or printout for another scientific purpose.

Does my “details” column answer this Question??Write detailed specifications for buying a good computer?

A computer, also called a processor, is an electronic device designed to accept data, perform prescribed mathematical and logical operations at high speed, and display the results of these operations. The main job of a computer is to process data we put in, then either store it or release it as an output for us.
There are three main components of a computer; Hardware, which is the associated physical equipment directly involved in the performance of data-processing or communications functions, Software, which are the programs used to direct the operation of a computer, as well as documentation and Users, who are people that use the software on a computer for various tasks according to their needs.
There are various types of computers, but when one wants to buy a computer for individual use, they should buy a Personal computer (PC). A personal computer is a small computer that can be used independently by an individual user for word-processing, games, e-mail or storage of information. These computers are the kind for everyday use that can be set on a desk, they are very popular. Personal computers range in prices depending on storage and processing abilities and speed. The major components of a PC are:
-system unit (physical apparatus) which consist of the desktop (screen) and the tower (that contains the CPU, RAM, power supply, hard disks and all the slots for connecting all the other components).
- A series of input and output devices and peripherals.
Every pc has a central processing unit (CPU). A CPU is a chip called a microprocessor that’s job is to perform computer processing done by following the instructions of the software or programs to process data and produce information. Every PC has at least one CPU located on the motherboard, which connects all the parts of the computer together. A CPU is also divided into more main parts; ALU, registers or immediate access memory and Control unit. The Control unit directs electronic signals between the main memory and the input and output devices. Input devices allow one to put information into the computer. Some of the many input devices needed for a good computer are a keyboard, Mouse (either laser or ball), a trackball, a touchpad, a touch screen, a light pen, a scanner, a joystick, a microphone, disk drives (including CD-ROMs, DVD-ROMs, floppy disk), a Digital camera and a Video camera. Output devices allow you to view information on your PC or extract information from your PC. Some of the most important products needed in order to be able to see things on your computer screen to the best of your ability are VDU (video display units, or monitors). These monitors allow the work being done on the computer to be displayed, as well as the results of processing, displaying texts, graphics and image forms. The best type of monitor for your personal computer is a flat screen, or flat panel display. This type of monitor is most popular these days. The characteristics of these monitors are color, size and resolution. The more colors it has the better the clarity of the images on your PC will be. The bigger your screen is, the better you will be able to do your work (most screens currently are about 17’’ to 21’’). The higher the resolution, the better quality and clarity of the display or screen will be. The LED Displays (light emitting diodes) is the light that turns on when you press the button to start the computer, this feature is also important in figuring out when there is a problem; the light will trigger a specific flicker showing the presence of an error. Another output device important for a good home computer is a printer. The kinds of printers vary, but the best kind of printer for a personal computer is the colored laser printer. This printer, though expensive, can produce a variety of images and texts. Speakers (or headphones) are another feature that is available for a PC in order for the user to be able to hear sounds. Yet another feature is the removable media devices used to transfer data or documents onto other devices. Examples of these devices are CD-writers, DVD-writers or USB- flash memory cards. Of the devices that are considered both input and output devices are modems and speech synthesizers. Modems are important for access to the internet, the World Wide Web, which connects users to people from all over the world. Each of these devices (both input and output) will allow you to use your personal computer to the best of its ability. It is also important that one buy a good brand name of each of these devices as well as the computer itself, in order to assure warranty and to have the best products available.