cos'è la differenza tra amorosa/o,ragazza/o,e fidanzata/o?

in che caso possiamo chiamare una donna "signora"?

risasunto Nanotechnology Nanotechnology is a broad term that covers many areas of research dealing with objects that are measured in nanometers (a nanometer is a millionth of a millimeter). It can be used at many fields. For instance, the field of medicine, the field of computer, the environment and so on. On the medical industry, patients will drink fluid containing nanorobots programmed to attack and reconstruct the molecular structure of cancer cells and viruses. It can be help us to fight with the disease. And in the computer industry, nanotechnology will create a new generation of computers, storing trillions of bytes of information in a structure the size of a sugar lump. Nanotechnology will also have a positive effect on the environment, for example it can help us to rebuild the ozone layer. Anyway, the nanotechnology can help us at many different part, so it sounds useful for us. Computer systems The components of computer are known as hardware. The term includes the memory that stores data and instructions. For example, CPU carries out instructions; the bus connects the various computer components. Data are stored in the form of bits. Every time a bit is added, the number of possible combinations is doubled. The physical memory of a computer is either ROM or RAM. ROM is different from RAM, because the data of ROM can’t be changed by the user. Memory can also stored on external equipment, such as CD-ROM,DVDs and USBs. Information from an input device or memory in a CPU memory location called a register. There are many different types of programmable computer, as we know PDAs, Laptop, workstations and so on.

Microprocessor A microprocessor is a universal logic IC chip which can carry out a set of actions in sequence by inputting instructions. The term microprocessor means the CPU (central processing unit) of a small computer system. According to the set of instructions, microprocessors can execute ,they are classified into RISC(reduced instruction set computer) and CISC(complex instruction set computer). A microprocessor consists of the ALU(arithmetic/logic unit)which performs arithmetic calculations and makes logical decisions. Digital information is carried by bus connections. A bus is a set of lines, each line is used for a single –bit signal, that connects many units. Other important elements are tri-state buffers, which can pass a 1 and a 0 or they can disconnect their output. Microprocessors are made by using techniques similar to those used for other integrated circuits. The room used for microprocessor fabrication is called clean room, because the air in them is accurately filtered and almost completely free of dust.

The birthplace of the transistor The birthplace of the transistor is silicon valley, California. The first practical transistor was developed by William Shockley, John Bardeen and Walter Houser Brattain in 1947. The Silicon Valley Region is a part of Stanford University. At the end of the second war Stanford University did not have enough money to fund its expansion plans, but there are lots of land which can’t be sold . So Frederick Turman, one of the senior administrators, found a solution. Instead of selling the land ,they could lease it for 99 years. The land is leased only to high technology companies that could benefit Stanford University. Now there are many companies in Silicon Valley, for example the Apple, Google, HP, Intel, eBay and Yahoo!. The first digital computer of the world which was called ENIAC was introduced in Silicon Valley and in 1971,the first microprocessor ,the Intel 4004 chip was developed here ,too.

Passive components Electronic components can be active or passive. Passive elements never supply more energy than they absorb; active elements can supply more energy than they absorb, thus producing amplification. If a circuit can be called electronic, it must contain at least one active device. Passive components include resistors, capacitors, diodes( di means two, while ode is short for electrode)and inductors. Active components include vacuum tubes. Caps is short for capacitors. It has many sizes and shapes, but their purpose is the same. They can store electrical energy in the form of an electrostatic charge. Some of the large electrolytic caps can store enough charge to kill a person. Resistors are the most common passive components. They have colored bands on them to indicate their value in ohms. LEDs (=light emitting diodes) are diodes that emit light of one form or another. They come in several sizes and colors. Some even emit Infrared Light which can’t be seen by the human eye.

saggio breve L’energia nucleare è una risorsa pulita per l’ambiente? L’energia nucleare viene ottenuta dalla fissione degli atomi,cioè i nuclei di atomi con alto numero atomico (pesanti) come,ad esempio,l’uranio,il plutonio e il torio si spezzano producendo nuclei con numero atomico minore,diminuendo la propria massa totale e liberando una grande quantità di energia. La percentuale di massa trasformata in energia si aggira attorno allo 0.1%,cioè per ogni kg di materiale fissile, 1g viene trasformato in energia. Da qui si può capire che l’energia nucleare può produrre più energia rispetto alle altre energie,per esempio l’energia solare e l’energia di vento. Però l’energia nucleare ha un aspetto negativo,cioè l’inquinamento della radiazione. Ricordiamo che nel 2011,a Fukushima,Giappone ,succede un terremoto molto grave. Questo causa il centro nucleare succede la fuoriuscita di radiazioni. Dunque il 95%di prodotto di Fukushima viene esaminato che esiste l’eccesivo di cesio. Inoltre una certa quantità di acqua per raffreddamento entra nel mare,causa l’inquinamento della radiazione,non solo questi, per gli abitanti di Fukushima c’è anche il rischio della salute. Quindi un gruppo di giapponese di esperti ed un organismo francese che misura la radioattività hanno fatto un testo su 10 bambini, di età compresa tra 6 e 16. Tutti i 10 sono risultati positivi per piccole quantità di cesio-134 e cesio-137. Il cesio-134 e cesio-137 sono due dei radioisotopi,ponevano il maggiore rischio per la salute. Ad esempio l’incidente nucleare di Cernobyl nel 1986,grazie alla radiazione,ci sono molte persone e animali che sono malformati. E fino oggi, 25 anni sono passati,lì esiste ancora la radiazione,la gente non può tornare al suo paese. Si dice che la radiazione si indebolisce fra 70 anni, oppure di più. Invece ,per l’uomo ,la nostra vita ha quanti cicli di 70anni? Quindi l’energia nucleare fa male all’ambiente e la nostra salute,possiamo definire che l’energia nucleare non è una risorsa pulita.

la differenza tra carino e bello? la differenza tra carino e bello?

una domanda del quiz di patente b quando si deve far scendere un passengero bisogna tenere presente che l'apertura della portiera di destra è priva di qualsiasi rischio e pericolo. perchè è falso?