Binary Input Output System

Binary Input Output System Task 1 Motherboard Name: Abit IS7-E Intel 865PE 800MHz FSB The biggest and most important circuit board of a computer system. The many components on a motherboard, they are CPU(socket),memory slots, HDD controllers and other socket and slots. Binary input Output System(BIOS),memory, mass storage interfaces, parallel and serial ports, controllers and expansion slots. It handles all memory, system resources and the processor. Power supply Name:600Watt power supply Provided through a power supply unit(PSU) to the computer. It perform (AC) current (110 or 220 V) to direct current(DC) 5V,12V,3.3V. Continuous 5power input is required for the proper Functioning of the system which can be provided through a direct power supply. Surge suppressors, power conditioners and Uninterruptible Power Supply (UPS) are commonly used for regulating the power input to the computer. Two type of power supply ATX power supply (24pin power supply) CPU Name: Intel P4 2.4GHz 512K HT 800MHz FSB Manages the processing and logical operations of a computer system. The two main components of a process or are the Arithmetic Logic Unit(ALU) and the Control Unit(CU).The ALU handles asthmatic and logical operation. The CUCU decodes and executes the memory instructions, processor is also commonly know as microprocessor or Central Processing Unit(CPU). Memory modules Name:DDR2 SDRAM (1GB) Storage space in the computer where digital data is stored. The main physical memory is called Random Access Memory(RAM) which allows data to read and written into it. Speed 800MHz, Pin 240. Storage devices Name: 3.5† Hard disk Drive (ATA) Maxtor 120GB 7200RPM ATA Main Storage devices is hardware device and Store information are permanently store information on a PC. Haft Disk controller pin40 Hard Drive Controllers device Circuitry that is responsible for the managing transmission of data from the computer to the hard drive and vice-versa. Display Devices Name:21† LCD Monitor Machine, which displays the data and information being entered, retrieved and the results of the processed data from the system. Some commonly used display devices are monitor, liquid Crystal Display (LCD) panel and touch screen. Adapter Cards Name: Hercules ATI Randeon9800XT 256MB Circuit in a computer system, which support a particular device. Video adapters are used to support graphics monitor. Network adaptors allow a computer to communicate with another computer. Also called expansion board, add-ons, add- ins or cards. Ports Names- RJ-4s LAN Purpose-To connect the system board and to be used input devices Characteristics-PS 2 -USB -Wireless Task-1(ii) Serial Serial ports are usually called communication port comport etc. Generally one computer can accept up to 4 serial ports (com1, com2, com3 and com4). Parallel Parallel ports must be used eight lines of wire and they can transfer the data as by the rate of eight bits in one time. So, they are only used one data line and their transference rate are five or ten times faster Fire wire The fire wire is the fire wire connector and plug most commonly used with PCs. Task-1(iii) CMOS(Complementary Metal Oxide Semiconductor) CMOS are used very less amount of power and does not generate a high amount of heat also, as it uses both the negative and positive polarity. This features makes it usable in computer system. Basic Input Output System Pre-integrated software which determines the actions of a computer which it can perform without accessing the disk. Present in the ROM chip and contains code for various functions and devices. Post Error Code 1 short beep Normal POST system is ok 2 short beeps POST Error error code shown on screen No beep Power supply or system board problem Continuous beep Power supply, system board, or keyboard problem Repeating short beeps Power supply or system board problem 1 long, 1 short beep System board problem 1 long, 2 short beeps Display adapter problem (MDA, CGA) 1 long, 3 short beeps Enhanced Graphics Adapter (EGA) 3 long beeps 3270 keyboard card The errors found in BIOS that occur during the post time can be distinguished into two. (i) Non-fatal error Normally, error message can be shown on Monitor Screen such as error which can do boot set up continuously on the compute is graded as non-fatal error. (ii) Fatal error The error which cannot continue boot setup and entirely stops and make a series of beep-code sound. Depending on the BIOS, these short beep – code help the operator distinguish the fault affecting on which part of the machine. Task 2 Task-2(i) The most popular type of motherboards is AT-style motherboard and ATX-style motherboard. Advanced Technology (AT) :The older form factor standard derived from PC-XT and PC-AT specifications. Advanced Technology Extended (ATX): A newer form factor standard that has been introduced to overcome problems found in the AT-style designs. The main components of a motherboard are the CU and its chipset, the system clock, the ROM , BIOS, the RAM, the system bus with expansion slots, jumpers and DIP, power supply connections and communication ports like the serial, parallel, USB and infrared ports. Industry Standard Architecture (ISA) bus. This Architecture was originally used in the IBM PC/XT and PC/AT. It is a very old technology used for connecting peripheral device. Task 2 (ii) Advanced BIOS Features This category displays the amount of memory detected by the BIOS. The value of the base (or conventional)memory is typically 640K or more memory installed on the main board. The value of the extended memory is the amount of memory located above 1MB in the main board. Fig.1 Standard CMOS Features The Standard CMOS setup screens from various BIOS manufactures all provide the same basic information .They can be used to set the system clock/calendar, establish disk-drive parameters and video display type, and specify which types of errors will halt the system during the POST. Fig. 2 Task- 2 (iii) a Print technologies Impact technologies( Dot-matrix printer) Non- Impact technologies(ink-jet, Laser printer) Ink-jet printer An inkjet printer is a non-impact printer that uses droplets of ink to create image on the paper. Inkjet printer is popular for home user due to its ability to print color. It is cheaper than laser printer but expensive to maintain. Inkjet’s cartridges need to replace frequently and special coated paper is required for high quality photo out. Task-2(iii)b Common Printer Problems When a printer has been out of paper, or had a paper jam, or some other condition that keeps it from giving output for several minutes, the lpq command ceases to indicate the particular condition, and simply shows it as stalled(n sec), with n>>1000. So if you see this message, you need to go to the printer itself and find out what is wrong. On the other hand, when a condition has been corrected, the lpq command may continue to report the condition for about a minute more; so a warning like No paper tray when the paper has just been reloaded can usually be ignored. You can likewise ignore the warning No daemon present when a job has just been submitted after the queue was empty. Task3 Network cable A Network is a collection of computers linked to one another allowing information and resources to be shared between them. A network is setup by connecting the various computers through the cables, connectors and connectivity devices such as hubs or switches along with which necessary protocols for enable communication between them are implemented. Any computer can access a network directly by using a network adapter expansion card also known as Network Interface card(NIC) and a network cable. Types of cable are Coaxial cable: Contains a central wire which is insulated and on top of which there is a braided wire. Coaxial cables can carry more data and are less prone to interference. Plenum cable: Has an outer shield made of Teflon which is a fire repellant and which does not produce poisonous fumes when burnt. Unshielded Twisted Pair (UTP)cable: Two cables and switched wires so that the noises of the two separate wire that are cover in a shield of foil, so that data transmission is safer. Connectors : Some Commonly connectors in a network Are: BNC, RJ-45,AUI, ST/SC and IDC/UDC. (ii) Five different technologies are 1. ASDL 2. Wi Max 3. IP Star 4. PSIN (dial up) 5. ISDN (digital) 1.ADSL Asymmetric DSL (ADSL) works by splitting the phone line into two frequency ranges. The frequencies below 4KHz are reserved for voice, and the range above that is used for data. This makes it possible to use the line for phone calls and data network access at the same time. This type of DSL is called asymmetric because more bandwidth is reserved for receiving data than for sending data. Asymmetric variations include ADSL standards facilitates interoperability between all standard forms of ADSL. Strengths The internet connection can remain open while the phone line is used for voice calls.DSL service employs phone wires between the home and the telephone switching center. Weakness ADSL works by splitting the phone line into two frequency ranges. The frequencies below 4 V Hz are reserved for voice, and the range above that is used for data.DSL service is not available in all locations. 2. Wi Max Wi Fi is used by wireless LANs. Strength : Mobile PC might be connected to printers, scanners or voice over IP headset. Laptop user would wirelessly connect to a digital project. Weakness: To extend broadband wireless connectivity to new locations and over longer distances. 3. IP Star Strength: can access from everywhere. Low Noise Block (LNB) removes the noise and convert into digital signal. Weakness: Weak signal is limited power available in orbit satellites tend to broadcast on very lower power. Extremely high cost between$100 to$ 600 million to build . 4. PSIN (dial up) As the distance between terminals increases ,it soon becomes impractical to use dedicated cabling to carry data .Fortunately ,a very extensive communications network is already in existence :the public telephone network. Strengths The world’s largest communications network is the public telephone system. When computers use this network to communicate with each other it is referred to as dial-up networking (DUP). Weakness Must wait for certain time to convert digital to analog and transmit ion is not binary but analog, so signal may weakness at certain point need exchange to pump up. 5. ISDN (digital Line) ISDN service offers high-speed access to the ,public telephone system. ISDN service requires digital modems. Strengths The fastest, most expensive ISDN service is broadband ISDN. This level of service provides extremely high transfer rates (up to 622Mbps) over coaxial or fiber-optic cabling. Weakness Two wire system is expended in four wire system thought a network terminator. Task-3(3) 5 Networking capabilities of Windows XP -Wireless Firewall -Offline Offer Remote Assistance Remote Desktop Task 4 Task 4(i) 10 Windows XP system files HAL.DLL: Hardware abstraction layer (HAL) driver that holds information specific to the CPU that the OS is running on. SMSS.EXE: A file that contains information to carry out pre -start functions such as running in boot time version of CHKDSK called AUTOCHTC. SMSS.EXE: A file that contains information to carry out pre -start functions such as running in boot time version of CHKDSK called AUTOCHTC. BOOT.INI: A text file that contains the boot loader menu that is displayed on the startup screen. BOOT SECT.DOS: Responsible for loading the operating system other than the default operating Ntoskrnl.exe: Executive and kernel, executive and kernel with support for Physical Address. Ntkrnlpa.exe: Extension (PAE), which allows addressing of more than 4 gigabytes(GB) of physical memory. User32.dll: Core Win32 subsystem DLLs. Test -4 (ii) ( Fig. 1 ) Microsoft Management Console Some of the windows 2000/XP management consoles are not loaded when the operating system is installed. However, they are available for installation from the Windows2000/XP CDs. These consoles are referred to as snap-ins. In addition to using the Control Panel, you can access all the installed MMCs by typing selecting Start, Programs, Administrative Tools, or by tying MMC in the Start, Run dialog box. The MMC is a flexible tool that enables you to add snap-in tools(utilities) to create custom management consoles that can be saved and used at any time .Extended discussions of these tools are presented throughout the remainder of the text as they apply to managing and troubleshooting the operating system. ( Fig. 2 ) Event Viewer System events include items such as successful and failed Windows computer startups ,as well as successful loading of device drivers. Likewise, application events include information about how the system’s applications are performing. Not all Windows applications generate events that the Event Viewer will log. Security events are produced by user actions such as logons and logoffs, file and folder accesses, and creation of new Active Directory accounts. Task Manager To start Task Manager, take any of the following actions: Press CTRL+ALT+DELETE, and then click Task Manager. Press CTRL+SHIFT+ESC. Right-click an empty area of the taskbar, and then click Task Manager. Task-4(iii) Interactively install a Plug and Play device You can use this procedure to install a device that is not currently plugged into the computer, and for which a device driver is not currently staged in the driver store. If a device driver is staged in the driver store, then it is installed with no interaction required by the user, and the Found New Hardware dialog box does not appear. To install a Plug and Play device interactively when you plug it in Plug the new device into the computer. In the Found New Hardware dialog box, select one of the following: Locate and install driver software. Selecting this option begins the installation process. For more information, see Additional considerations in this topic. Ask me again later. The device is not installed and no configuration change is made to your computer. If the device is still plugged in the next time you log on to the computer, then this dialog box appears again. Dont show this message again for this device. Selecting this option configures the Plug and Play service to not install the driver for this device, and does not make the device functional. To complete the installation of the device driver, you must detach the device and reattach it. Task 5 BIOS is a collection of programmes written in low-level language (mostly assembly language) and it has to carry out the functions necessary for computing the boot during the period between point of the computer power to the starting point of the operation system. There are many thousands of individual error messages; some are more common than others because there are only a few different BIOS companies that are used by the majority of PCs out there today. However, since the exact wording of an error message can be changed by the manufacturer of each system or motherboard, there are a lot of variations. The common problem of error codes and message from the boot sequence are CMOS battery failed CMOS checksum error – Default lobed . Task-5(ii) The following utilities will help you troubleshoot the most common causes of system problem 1. Microsoft Management Console 2. Disk Defragmenter 3. Control Panel 1. Microsoft Management Console Microsoft Management Console (MMC) hosts administrative tools that you can use to administer networks, computers, services, and other system components. For help with specific tasks. For general background information. For information about accessibility features. For problem-solving instructions. 2. Disk Defragmenter Disk Defragmenter is a system utility for analyzing local volumes and locating and consolidating fragmented files and folders. You can also defragment disks from a command line using the defrag command. Before defragmenting files or folders. For tips about using Disk Defragmenter. For help with specific tasks. For general background information. For problem-solving instructions. 3.Control Panel The Windows XP Control Panel, also offers some additional features and functionality not in previous Windows 9x and NT/2000 versions. In Windows XP, the Control Panel options is included directly on the Start menu instead of a submenu. Under the native Windows XP version of the Control Panel, the applets are organized into nine related categories. The view that display the Control Panel items is referred into as the Category view. Reference Web Reference www.pchell.com http://img80.imageshack.us/img80/1634/ddkx48pb02yf2.jpg www.computerhope.com/issues/ch000980.htm www.articlesbase.com/communication-articles/wireless-broadband-how-to-improve-the-signal-strength-in-your-home-589595.html Book Reference (1)Fundamentals of Hardware and Operating Systems(Operating System Technologies) (2)Fundamentals of Hardware and Operating Systems(Hardware Service Technician) (3)Tease’s Practical Guide for Computer Hardware Peripherals

Do males and females have different abilities when estimating size?

Question: Do males and females have different abilities when estimating size? Abstract This science research the different abilities in reckon sizes between males and females. And the research was taken from an experiment with 20 Chinese teenagers between 15 and 18. The hypothesis was males’ abilities when estimating sizes is better than females†¦. Introduction As we all know, males and females are different in many abilities, and this research for testing difference between males and females estimating size.And this ability also is affected by the cultivation from the child, their brain have different talent. The hypothesis was those males’ abilities when estimating size is better than females’ abilities. Research Methodology In this experiment, there had 10 males’ and 10 females’ age from 15 to 17 as experiment objects. Firstly, a textbook (width: 20. 7cm), a MP3 (length: 8cm) and an ID card (width: 5. 4cm) were measured by a ruler. In each s ubject, everyone stood one meter away from me, and then they could observe each one for 10 seconds.After that, they should tell me their estimation. Finally, the data was collected into the table to comparison and prove the assumption. Research Results The results were inconsistent with my previous hypothesis; females can estimate stuff more accurate than males. The raw data of males’ and females’ measuring results of textbook, MP3 and ID card were cleared up to Appendix 1 and Appendix 2. The table below shows that the experimental results of different gender of teenagers from 15 to 18 have different estimated capacity.As we can see clearly from the mean about textbook, males was 20. 24cm and females was 18. 4cm, which shows males had 0. 46cm of the deviation and females had 2. 3cm of the deviation. And from the result of MP3 and ID card, the males were 7. 11cm and 4. 61cm, however, females were 7. 5cm and 5cm, these describe females’ measuring results were more accurate. | textbook (20. 7cm)| MP3 (8cm)| ID card (5. 4cm)| | Mean (cm)| Error| Mean (cm)| Error| Mean (cm)| Error| Male| 20. 24| 0. 46| 7. 11| 0. 89| 4. 61| 0. 79| Female| 18. 4| 2. | 7. 5| 0. 5| 5| 0. 4| *Error means actual value – average and all values are absolute value Discussion Compare the results and the hypothesis, the results show females’ ability in estimating sizes is better than males’ captivity. So this result is not the same as the hypothesis we put forward. We can see from these two tables below, when males and females estimate the bigger size (textbook), the accuracy of males guessing sizes is more accurate than females, and the mean of males’ result is 20. 24cm, the error just is 0. 46cm,

Reflection paper Essay

â€Å"Mabuhay ang Pilipinas! †, after watching Jose Rizal the Movie, these are the words that wanted to find its way out into my mouth. Words that wanted to travel beyond distance and beyond boundaries that would defy ages to finally find a resonating voice that sent earthquake to the stoned floor of the holy temple of God that sheltered fiends who clothed themselves in white and who spoke His words with fluency but undoubtedly knew nothing of His language. I could not say it better, as a realization hit me, but I admire my Motherland. I could not help but think how did she, after everything that was done to her, have found it in her heart to forgive? The film did not only depict the life of Jose Rizal during the gripping of the Spaniards’ iron hands but also the Filipinos during those darkest times before the crack of dawn. The movie did not also just settled for only Rizal and the Filipino people during the Spanish colonization, but it made a sort of movie adaptation of the two notable masterpieces of Rizal; the Noli Me Tangere and the El Filibusterismo. The movie itself was faithful to accuracy that you could see what it wants people to see and that is to see. The movie suggested us to see what had really happened to our motherland. It is to see what she had been through to keep her standing in her place in the map of the world. It is to see how many times our country had lost her identity, her dignity, her freedom, her voice, her rights, and her name. It is to see how many lives she had to remorsefully sacrifice just to keep standing. Watching the movie, I saw her. She took all pain and suffering and given up almost everything she has because she loves her children. She love the Filipinos that she kept standing and resisted the embrace of the god of the sea for us to have our feet on earth to land on. Realizing all she had borne made me proud to be molded from the earth of the Land of the Morning. Jose Rizal the Movie made it crystal cleared to everyone who would watch it how the Filipino people loved our country that they had given up their lives to free her from her iron cage. The movie showed that during the time of Rizal, Filipinos had started stirring from their seemed to be forever slumbering, although the Spaniards oppression continued to darken the skies. During those times, as portrayed, there was social unrest that resulted revolts. Most prominent movements were initiated by the Katipuneros led by Andres Bonifacio. A lot of native eyes had started to see the real faces inside the holy veil worn by the Spaniards that led them to the realization of their own scraped image. Spaniards had continued to use religion, specifically the teachings of the Catholic Church and the words of God to frightened majority of the Filipinos to conform and manipulate them. The film portrayed the Spaniards abuse of power and authority over the Filipinos. Friars shrouded their corruption in the cloak of church contributions and tributes. They collected high imposed taxes from the farmers who till their own soil. They acquired lands by authority and force. Worst of it, Spaniards did not content themselves in getting hold of our country but also our dignity. Filipinos had been treated unfairly. The Spaniards made sure that we had no equal human rights, no parity before the law, no seat for the government, no mercy from the church, and no place for morality. Filipinos became slaves. Our native women were victimized. There was racial discrimination. Only elites were granted to have a formal education and even in school, Filipinos were slandered, mocked and belittled. Even the justice system was in favor of the State. Filipinos who have committed crime in the eyes of their justice were subjected to persecution and death. Spaniards would then scheme any person who go against their regime; that would include the conspiracy they had done to Rizal as he was sentenced by prejudiced to death before his trial was even performed. They stripped our nation’s identity and clothed us in ballooned dresses to conform but even so denied our right-I believe-to baptize our country a name. Those lowest times, people who had finally perceived the truth tried to raise their voices but mostly failed to do so because there was no firmed foundation. Their flares were not enough. When Rizal gave light, flickers were rekindled to a raging fire. Jose Rizal became their source of strength though he did not purposely want to ignite insurgency. Though his writings were double edged sword, he wanted to address his appeal for freedom and equality in a diplomatic manner. Unfortunately, it did not go as planned because not only the Spaniards wanted to bind him for the trouble he had cause to the name of the Spanish government. I really liked the portrayal of those people close to Rizal after he was shot and had fallen on the ground; none of them even shed a tear. They held their ground, Rizal was not a traitor. They were the ones who held his pride when he was deprived to die with dignity. He doesn’t deserve a cry of sympathy because he had done nothing but to love and to be faithful to his country. Because he was not married to a woman; he was married to our country, faithfully. Watching that scene, I felt dignified. He was not a traitor and so were those lives that fought to free our country. They were Filipinos who desired to regain our freedom and identity from the Spaniards. As the movie concluded, I realized I have never been so proud of my country, and never did I really give proper acknowledgement to the many lives that, especially those nameless faces that did not have the chance to have a space in paper. â€Å"Give credit to who is due†, as the saying goes. All of us, we walk in different paths of life. We see strangers every day but I never really consider looking at their faces in a different way. After watching the film, I learned to see the faces of past through the faces of the present. We are all carrying fragments of souls of the people of the past. How we are giving shape to those fragments of souls is the real challenge in us. I have learned from watching the film how embarrassing we have become to cater these fragments in us because we failed and ignored to recognize them and the way we savor the liberty they struggled to regain but tragically did not had the chance to hold. These souls had once fought for freedom. We have to see them in us to fix how we abused our freedom. I still see our motherland in her situation back then because we failed to get the lessons from our past. How many more times does she have to be in same situation she thought she had been freed from? One lesson I clearly got from the movie, we have to carry the past in us like it is our own experience for us to never want to be in that situation again. We should never forget our own history and the importance of it, for the sake of those souls who only had the chance to experience true freedom in us.

Visas para mexicanos turista, trabajo y estudio

Obviamente, los  mexicanos pueden obtener todas las visas americanas disponibles para todo el mundo. Ademà ¡s, tienen visas disponibles solo para esos nacionales para visitar, trabajar y estudiar. Todas esas ventajas afectan a visas no inmigrantes. Por el contrario, en las visas de inmigrantes para obtener la green card los mexicanos resultan perjudicados. En este artà ­culo se explican por un lado, los  caminos abiertos a mexicanos con  mà ¡s facilidades y, por otro,  tambià ©n los caminos cerrados. Visas de turista para los mexicanos Los mexicanos pueden obtener las visas de turista y de negocios conocidas como B1/B2 que aplican a todos los extranjeros. Pero ademà ¡s, si viven en la zona fronteriza con Estados Unidos, pueden solicitar si asà ­ lo prefieren una visa là ¡ser  que tambià ©n se conoce como tarjeta de cruce. Hay que tener claro que las là ¡ser son muy cà ³modas para cruzar la frontera de una manera rà ¡pida. Pero tienen importantes limitaciones que las distinguen de las visa que se sellan en el pasaporte. Por ejemplo, con una visa là ¡ser la estancia en Estados Unidos no puede ser superior a 30 dà ­as. Ademà ¡s, està ¡ limitada la entrada a 25 millas a contar desde la frontera. Con la excepcià ³n de ciertos puertos fronterizos como Nogales o Douglas que permiten internarse en el interior de EEUU hasta 75 millas. Ademà ¡s, es muy importante saber que sà ³lo se pueden utilizar en puestos aduaneros terrestres. No sirven para viajar a Estados Unidos por barco o avià ³n. Por à ºltimo, estas visas tambià ©n las pueden solicitar los extranjeros que residen legalmente en Mà ©xico y tienen su domicilio en la zona fronteriza. Visas de trabajo para mexicanos Ademà ¡s de las visas de trabajo disponibles para todos los extranjeros, existen visados que sà ³lo aplican a los mexicanos o a un grupo limitado de nacionales de ciertos paà ­ses entre los que se encuentra Mà ©xico. Los profesionales pueden acceder a una visa TN, creada al amparo del Tratado de Libre Comercio de Norteamà ©rica (NAFTA). Tienen una tramitacià ³n especial y pueden beneficiar a un amplio abanico de profesiones que se encuentran listadas en Apà ©ndice 1603.D.1 y que son estas 60. Para poder solicitarla, es preciso tener una oferta de trabajo a tiempo completo o parcial. Està ¡ expresamente prohibido el autoempleo. Ademà ¡s, existen visas no inmigrantes para trabajar temporalmente en Estados Unidos a las que pueden acceder los nacionales de ciertos paà ­ses, entre ellos los mexicanos, que de hecho son la nacionalidad con mà ¡s visas aprobadas en las categorà ­as H-2A y H2-B. Por ejemplo, las H-2B  sirven  trabajar en una gran variedad de empleos, muchos de ellos en el sector turà ­stico y que no requieren de estudios superiores. Para esta categorà ­a se pueden ofertar un mà ¡ximo de 66.000 mil visas por aà ±o fiscal. Generalmente se conceden por un aà ±o, pudià ©ndose extender hasta un mà ¡ximo de tres. Ademà ¡s, està ¡n las H-2A para trabajar en el sector de la agricultura. El cà ³nyuge y los hijos solteros menores de 21 aà ±os de una persona a la que se le dà © esta visa pueden viajar con à ©l o con ella a Estados Unidos, si bien tienen prohibido trabajar mientras dure su estancia. Pero lo hijos podrà ¡n estudiar en las escuelas americanas. Este es un listado de mà ¡s de 60 reclutadores mexicanos de trabajadores temporeros para trabajar en Estados Unidos. Diferentes a las visas de trabajo son las de inversià ³n, pero permiten trabajar en la empresa que se crea. Los mexicanos pueden acceder a las E-1 para empresas de import/export y a las E-2, donde hay que tener claro desde el principio cà ³mo entender el monto de capital que se debe invertir.   Las visas de inversià ³n E-1 y E-2 pueden ser disfrutadas, ademà ¡s, por ciudadanos de otros paà ­ses, pero no de todos. Visas para estudiar en Estados Unidos Ademà ¡s de las tà ­picas F-1 y M-1, los mexicanos y los canadienses que viven a lo largo de sus respectivas fronteras con Estados Unidos pueden estudiar en este paà ­s con una visa F-3. Esas visas son atractivas pero tambià ©n tienen inconvenientes, como por ejemplo que sà ³lo se pueden utilizar para estudiar en escuelas y universidades que està ¡n a un mà ¡ximo de 75 millas de la frontera. Cà ³mo acelerar el paso por el control migratorio de Estados Unidos Los mexicanos pueden formar parte de programas que permiten un pase mà ¡s rà ¡pido por el control de las autoridades de Inmigracià ³n de los Estados Unidos.   Para las fronteras terrestres y marà ­timas, se puede utilizar SENTRI, mientras que para ingresar a USA por un aeropuerto el programa correcto es Global Entry. Malas noticias para mexicanos En los pà ¡rrafos anteriores se seà ±alaron importantes ventajas para mexicanos. Sin embargo, no todo son buenas noticias. Y es que la alta tasa de inmigracià ³n mexicana en los Estados Unidos provoca que en algunas categorà ­as migratorias debe esperar mà ¡s aà ±os para emigrar o, simplemente, algunos caminos les està ©n prohibidos. Por ejemplo, los mexicanos, junto con los indios, chinos y filipinos deben esperar mà ¡s aà ±os que el resto de nacionalidades en ciertas peticiones de familia, como por ejemplo las peticiones de ciudadano para hermanos o hijos casados o hijos mayores de 21 aà ±os. Asimismo, no pueden participar en la loterà ­a de visas de la diversidad, que permite obtener la green card a los ganadores de un sorteo. Este es un artà ­culo legal, es meramente informativo.