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Nokia Developer Windows RT tablet plan came the news is not the first time foreign media has brought us further news. According to technology website The Verge quoted sources as saying the disclosure that, very similar to the Nokia display screen of the tablet with the Microsoft Surface RT screen and support 3G network, the formal launch of Mobile World Congress in February next year at the earliest.

10.1-inch touch screen

According to technology website The Verge reported, sources disclosed, said to them, Nokia tablet will be equipped with a 10.1-inch touch screen panel, and the screen is very similar to Microsoft's Surface RT (which may mean that the retina screen legend is not exist), and is also equipped with HDMI interface and USB interface, support 3G network.

Nokia Tablet computer really attractive, however, is unique shell design. According to the related statement, the tablet Nokia will launch a special "jacket" usual, when combined, will make the Tablet PC look like a book. Opens, this jacket can be used as the Tablet PC's keyboard and the use of outriggers.

Outstanding battery life

Nokia tablet for this special "jacket" built-in battery and provides two USB ports to expand the connectivity of the device. Nokia tablet they are satisfied with the performance of the battery life, able to provide about ten hours of battery life, in a short period of time but also fast charge to 50% of the battery capacity.

According to sources say, Nokia's first tablet will run on the ARM chip architecture, and powered by Microsoft's latest operating system Windows RT. At the same time, the leak news from the past show Nokia Tablet PC will likely be powered by Qualcomm Xiao Long S4 dual-core processor, built-in 800-megapixel camera, and will provide a variety of colors to choose.

MWC2013 Assembly Release

Other features of the Nokia Tablet no more messages, but U.S. carriers, AT & T will be the starting cooperation channels in almost not much suspense. Past news that Nokia plans to launch the tablet in the first quarter of this year by Taiwan's Compal to undertake the production of initial large shipments of approximately 200,000 units. Just because Microsoft will launch its own Tablet Surface, causing Nokia to postpone the plan, and decided to focus on the smart phone market.

According to the latest news, Nokia will be the fastest MWC2013 Mobile World Congress in February next year, launched the tablet. Nokia declined to publish for comment, a company spokesman said: "The company does not comment on market rumors and speculation."     

Switching power supply switch tube from the conduction to the cut-off, strictly speaking, is a very complicated process, but when we work principle analysis, will first try some non-major problem simplistic. For example, when the power switch tube turned on or off, we put it as an ideal switch its work only two states, on or off. But fact the switch tube conduction and off is a very complicated process, which in addition to ON or OFF, there is a high frequency can not be neglected, that is, the switch conduction is from the cutoff region to the enlarged area, and then by the enlarged area to work in saturation region. This process requires differential equations can be solved here, I do not want to introduce to you, too complicated.

Simply put, the power switch turn-on and turn-off time are needed. Generally simply switch conduction time ton into the turn-on delay time td and conduction rise time tr and switch off time toff to divided into close delay time tstg (or close the storage time) and shut down the decline time tf.

Figure 1 is a power switch turned on and off during the test waveform in fact the test waveform in Figure 1 is also simplified the actual waveform, the rising edge of the waveform is generally a rate of change of the positive index curve, while The falling edge of the waveform is a rate of change is a negative exponential curve, for simplicity, in Figure 1 are replaced with a straight line.

Switching power supply in the first cycle, the output voltage of the the filtering energy storage capacitor charge because the charging current is large, the load will be heavy (or equivalent load short-circuit), so the switching power supply in general should take a soft start measures the beginning of the duty cycle is very small, before slowly become normal, that began when the output power is very small, then slowly larger. Or the beginning of time, low operating voltage, then slowly increased to normal.

Strictly speaking, the switching power supply is always working in the non-steady-state, the so-called only relatively stable. For example, the process of switching power supply regulators is this: When the output voltage increases, after sampling, the sampling circuit outputs an error signal to a pulse width modulation circuit, so that the duty cycle is reduced, so that the output voltage is reduced; when After the output voltage is reduced, compared After sampling, the sampling circuit will output an error signal to a pulse width modulation circuit, the duty ratio is increased, so that the output voltage increases, so that repeated cycle, the output voltage of the switching power supply will always be at a certain the frequency of the average value of the voltage up and down swinging, but the average of the output voltage relatively stable as that so-called regulator.

For the current flowing through the the switching transformer primary coil is not a stable value, are generally a sawtooth wave rectifier output current. LED constant current drive , is generally means after filtering by the filter output current is relatively stable, and this stability is also means average, while the input current of the filter are generally a sawtooth wave.

Switching power supply start cycle is generally considered to begin from the switch conduction operator, which mainly depends on where you want to analyze the circuit cut refers switching power supply circuit when work, this can be considered If you need to analyze the various points of the waveform, you must take a device in the circuit waveform as a reference point (or sync) from the power switch is turned on to start work.

Usually sampling at the beginning of the first cycle of the switching power supply circuit is basically not working, because the output voltage on the filter capacitor is charged, the need can be charged to the normal after several cycles, only the output voltage reaches the normal, the sampling circuit to work properly. However, the sampling circuit is not working properly before the absolute value of its output voltage is equal to 0, which can be considered a special case of the error signal output (negative maximum). In such cases, switching power supply does not have a soft-start circuit, when the switch work, the duty cycle will easily transformer saturation, and damage to the switch.

  

Around us, there is always a lot of whimsy guy, they make the world more fun.
1. The electronic pet dog

Electronic pet dog

People still remember the electronic pet? The Bandai latest design of a new toy software can become typical virtual electronic pet. People simply from Download TechPet phone application software, through the touch screen can electronic pet dog feeding.

2. Google Glasses

Google glasses

Simply put, this is a computer built-in spectacle frames. Piece of glasses with a half-inch (1.3 cm) screen, you can use it to shoot and share photos, video chat, check appointments, access map and the Web. By 2014, consumers can buy Google glasses.

3.3D Intelligent Printer

3D intelligent printer

Download or create a new pattern, click on the Print button, and an area of a few 3D printer can extrusion ultra-thin plastic , print out the physical layer by layer, and you are willing to print the number of copies can be. Compared with the the MakerBot previous generation models, the latest Replicator2 efficient, more accurate printing software more easy to operate, and you do not need to assemble the machine. With Replicator2, anyone can set up a small factory at home.

4. Bamboo iphone speaker

Bamboo iphone speaker

This bamboo speaker can enlarge the the iphone phone's sound, and can enhance the three-dimensional, no external power supply.

5. The high-speed bat suit

High-speed bat suit

In October, the first wing mounted flight World Championship held in China, the flight wearing a bat suit who jumped from 5000 feet (1500 meters) cliff, gliding through a valley, eventually falling to the ground to open the parachute in 30 seconds flying within three-quarters of a mile (more than one kilometer). Only 20 are eligible to participate in the competition, Julian Boulle (JulianBoulle) South Africa won the championship and set a world record, his score 23.41 seconds.

6. Water jet backpack

Water jet backpack

French inventor the water sprinkler backpack design not only allows people jumped to the air 30 feet from the water, can dive into the water like dolphins.

7. Quantum invisibility cloak

Quantum invisibility cloak

The latest U.S. military investment in the development of the a "Quantum stealth" material, able to bend light waves in the coverage's body, so that people like Harry - Potter's invisibility cloak effect. The material is called "quantum stealth camouflage material, by bending light waves around the human body, so that the people covering the fabric is completely invisible status.

8. Automatic pneumatic tires

Automatic pneumatic tires

When tire pressure is too low, this Goodyear tire can be detected automatically turn on the built-in pressure detector in insufficient air pressure, allowing air to enter the trachea of a pump . The rotation of the wheels, the tire by squeezing parts at the bottom of the air is discharged from the pump in the trachea. When the air pressure to achieve the best state, the pressure controller off.

9. Solar Bonsai Charger

Solar Bonsai Charger

French designer to design a "electronic bonsai, it leaves 27 solar battery panels for charging mobile phones and other electronic devices, in the case of a sunny, four hours on the phone will be able to complete charge.

10. Small Artificial Indoor Clouds

Small artificial indoor clouds

This is not the image of the PS processing, the Dutch artist Ben De Nute latest invention - M. Stewart how to create indoor white clouds. This requires precise and meticulous planning and design: temperature, humidity and light must be just right. When preparing the conditions are ripe, M. Stewart, a smoke to manufacture this indoor artificial cloud. It lasted a very short time, but it is very beautiful, wonderful move.   

According to foreign media reports, after the advent of the Windows8 system, touch screen than before, more useful. However, some of the technology industry pundits have been convinced that the touch screen does not apply to the laptop. They sometimes quoted Steve Jobs in 2010, said the sentence: "The touch surface do not want to put on end." Jobs was to explain to the world why Apple laptop did not use the touch screen technology.

Earlier this year, Apple CEO Tim Cook (TimCook) also said: "You can be integrated into the oven and refrigerator together, but the kind of things could not get the user's favorite."

This is the view of the leaders of the world's most profitable technology company. I am sure, but I do not know why, this month or stop to visit my MacBookAir screen.   I evaluation of various laptop for TheVerge, I recently tested a series of touch screen notebook product based Windows8 system. Well from the outset, I ready to greet disappointment, I'm ready for a rhetoric, such as Windows8 gesture control technology with the touch screen can be more easily operate a computer, but the whole idea is not how another example Windows8 interface to many impose unnecessary touch-screen control functions to the users, the users are certainly not like as, in particular, certain features traditional laptop has done very well.

As I Windows8 process become more aware of this system and I am increasingly convinced that the future development direction of the touch screen is the laptop, even if it's touch screen is placed vertically.

Jobs in 2010 publicly opposed touchscreen laptop, he relied only on decades of user experience research "gorilla arm syndrome" common sense, to say, is that if you are in front of the touch screen, arms stretched out and period of time, you will feel especially uncomfortable. However, there are a lot of assumptions, if you do not your arms stretched out in the air, ready to touch anything, but to stay in a very comfortable stance on the keyboard?

We view this problem has been wrong. The touch screen is not a keyboard or a mouse substitute, but a supplement. If I want to enter some content on a laptop, and I have enough room to stretch the arm, then, I would still choose the keyboard input. But if I was living in a crowded car or on the plane, or in line, and I have to do only with a very short reply to an e- mail, then use based Windows8 touchscreen laptop will easily complete these tasks.

But perhaps it is just an extreme example. In daily use, I found that no matter whether I was using the equipment with touch screen function, I will help to tap the screen, because I want to finish something faster, more intuitive.

If you want to start a program on the desktop computer, which mode of operation will be more effective? Crouching close to a special glass surface with your fingers gently slide easier, and then click on the icon above? Or find a visual icon and click on it easier? When you want to close a program, try to move the mouse pointer to the upper right corner of the dialog box that small "X" icon and click on it easier? Or with ALT + F4 shortcut keys easier? Or directly dropping the in the Windows8 page will process easier
Of course, these operations are particularly meaningful for the Windows system, because the touchpad experience under the Windows system has been very bad. This year, we tested some pretty good, relatively speaking touchpad, but on the whole in terms of those touchpad there is still a lot of loopholes, and also often occur without reaction. In contrast, these Windows8 laptop touch screen is like a fresh breeze is refreshing. Their poor performance is because I want to really try the touch screen, but even if their performance is not so bad, I think I would choose the direct control of the way through the screen. After all, with my MacBookAir touchpad is very general, and I always have to constantly remind myself not to go to the start bar on the touch screen.

Unfortunately, Windows8 been able to get outstanding performance and specifications of the display on the touch screen. Display greater resolution is lower, with a finger on the touch screen the easier to operate, because in that case, the icon will be relatively greater.

The problem is that the touch screen's low resolution makes icons appear. Windows8 does not seem to 1080p the small screen optimization, and even if you lower the resolution or DPI, so that you can get a larger touch targets, the Windows8 icon and has not changed much bigger. IE browser, you can quickly zoom zoom feature by clicking on the target, but Microsoft does not Windows8 system a similar shortcut scaling function.

Instead, Apple has a solution developed for this problem, and from the iPhone4 application. Retina display's pixel density is four times that of ordinary display, it will make the image look more sharp, but to touch the target, or the same size as before. iPad2 and third-generation or fourth generation of the iPad user interface is completely the same, just the image displayed on the display of a new generation of products more clear and sharp. Apple's 15-inch and 13-inch MacBookPro with Retina display is not a touch screen, but also with four times the pixel density of the same technology.

Apple did not develop the world's first MP3 player, the first touch screen smart phone, the first graphical user interface, the first tablet computer or first laptop solid-state drive. It is like when shot, etc. a mature technology, but the industry also do not quite understand how to properly use it. In this issue on the touch screen for a laptop, a similar situation may also occur. Perhaps Microsoft has verified this idea is feasible, but Apple now have another opportunity to get into the market, that is, the user interface is perfect and promote it.

Outgoing Intel CEO Paul Otellini (Paul Otellini) said Windows8 system is a semi-finished at the time, I believe he meant: Microsoft certainly see the direction of the development of the user interface, but no one able to be optimized for the next generation of touch screen user interface. If we now hear is true, Microsoft has a chance to correct the error, but the speed is faster than you think. Microsoft ready system upgrade once a year after the launch of Windows Blue If Microsoft is able to solve the problem of the user interface zoom adjustment, to find the Retina display alternatives or other user-friendly touch screen panel technology, Windows will be able to keep it in touch screen leader in the field. If Microsoft is able to seize this opportunity, in 2013, it can avoid Apple beyond.