Showing posts with the label C

Facebook founder married and became a homely person

MARK ZUCKERBURG GETS MARRIED!In a surprise ceremony, Facebook CEOand founder Mark Zuckerberg marriedhis longtime girlfriend, Priscilla Chan,in a private wedding at his home inPalo Alto California on Saturday.Zuckerberg, who just became abillionaire as a result of the FacebookIPO on Friday, reportedly placed a ringon his wife’s finger during theceremony — the ring was describedas featuring a “very  simple ruby.”According to the Associated Press,Zuckerberg’s marriage to PriscillaChan took place in front of about 100invited guests who thought they werecelebrating Ms. Chan’s medical schoolgraduation. It all happened inZuckerberg’s backyard.Take a look at Zuckerberg’s personalpage on Facebook, and you’ll see theabove picture, which Zuckerbergreportedly placed onto his own site asa change of his status after theceremony.The couple met while both wereattending Harvard, and have beentogether for nine years. —

Energy Conversion Calculator

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Clutchless multi-speed gearbox

Look, no clutch Multi-speed transmission changes gear without interrupting torque Who Transmission specialist Zeroshift has devised a multi-speed gearbox for electric vehicles (EVs) that needs no clutch: a damper inside the gear hubs and electronic control of the motor make ratio changes seamless. Having more than one gear ratio and the ability to shift without interrupting torque means the motor runs at higher efficiency, extending range and batteries’ life expectancy by up to 10%. Technology Development of the concept is under way using Zeroshift’s proprietary gear-shifting system. The innovation could enable manufacturers to downsize EVs’ electric motors, keeping them running longer at the medium loads and speeds where peak efficiency of more than 95% is possible. For drivers, that could mean more performance, greater range and longer lasting batteries. Zeroshift’s concept prevents any torque interruptions during ratio changes and does not require a clutch, issues that have so far d

Clutch, Discbrake, steam boiler line diagrams

Clutch Basic Disc Brake Steam Boiler Brake system

concept commercial Air Bus

The Airbus Concept Plane -- reality or really far out? The  Boeing 787 Dreamliner  has finally landed, but what will the air passengers of 2050 look for in a commercial plane? If one asks Airbus, passengers of the future will go gaga over their Airbus Concept Plane. The design is intended to improve environmental performance with ultra long and slim wings, semi-embedded engines and a U-shaped tail resulting in a lower fuel burn, a cut in emissions and less noise. Airbus also suggests that ‘green’ energy sources might power some systems on tomorrow’s aircraft, hinting that even passenger's body heat could play a role. Where things get really compelling is inside the Airbus Concept Plane. Airbus talks of "morphing seats made from ecological, self-cleaning materials, which change shape for a snug fit; walls that become see-through at the touch of a button, affording 360 degree views of the world below; and holographic projections of virtual decors, allowing travelers to transfor

new Audi A5

Sportiness and intelligence is what Audi were aiming for in the new Audi A5. The headlights as well as rear lights have been redesigned, and the new colors and materials complement the interior. Improved efficiency is seen with the 11% reduction in fuel consumption. You will have more fun driving this vehicle, what with the Audi drive select system and the dynamic steering, as well as the electromechanical power steering that is new to the Audi A5 family. Known for their Sport-back Coupe and Cabriolet, the A5 have always been elegant, and the product improvement has added a millimeter to each of the exterior dimensions.

New Fiesta Sport Special Edition

The New Fiesta Sport Special Edition comes with an impressive sports styling and special external detailing and upgrades. Luxury extras have been added to its interior to give high-quality. This model comes even as Ford celebrates its 35 th  anniversary, proving that Ford is not about to let up on its popularity any time soon. The dynamic sports body and special styling additions give the model a bolder and more distinctive appearance. It also comes with 1.6 liter engine options that ensure that the vehicle delivers in performance too. Its panther black alloy wheels complete the exterior upgrades, and you also have silver alloy wheels as an option.

Red Ferrari

Red  Ferrari


Protect your valuable laptop against theft using this miniature alarm generator. Fixed inside the laptop case, it will sound a loud alarm when someone tries to take the laptop. This highly sensitive circuit uses a homemade tilt switch to activate the alarm through tilting of the laptop case. The circuit uses readily available components and can be assembled on a small piece of Vero board or a general- purpose PCB. It is powered by a 12V miniature battery used in remote control devices. IC TLO71 (IC1) is used as a voltage comparator with a potential divider comprising R2 and R3 providing half supply voltage at the non-inverting input (pin 3) of IC1. The inverting input receives a higher volt- age through a water-activated tilt switch only when the probes in the tilt switch make contact with water. When the tilt switch is kept in the horizontal position, the inverting input of IC1 gets a higher voltage than its non-inverting input and the output remains low. IC CD4538 (IC2) is used as

CAT 2011 online registration

CAT 2011 takers can fill up the CAT 2011 online registration form via following link:  . The website is being operated by Prometric (the company that conducts GRE in India and assigned the work to conduct online CAT). There is a guide available which helps you understand how to fill the CAT online registration form. You can look at it here:  (PDF). has reported that there are several errors in the online registration form. Few of them are - The STD code has been labelled as 'Country' code. Address Line 1 does not accept more than 30 characters, making it very difficult to enter correct address. Also, it does not accept any special character. By the time you end the last line of the form, you've already exceeded the time limit to fill up the form. You're notified with a message that says your session has expired and you should 'login again' to proceed. Application Form - Has Erro

Beginners of C language

 welcome to the series of C programming tutorials I request not to post questions or anything in this thread, as it will only disrupt the flow and co-ordination of the tutorials. OK everyone, this tutorial is basically designed for programmers, basically new to computing or new to "The C-Language". So now let us get started with the C. History of C  C language was developed by Dennis Ritchie in early 70s at the Bell Laboratories for Unix operating system. C is a procedural language. C was influenced by B, ALGOL, FORTRAN and Assembly. C influenced most of the modern world programing languages which include the mighty C++ and Java as well. Above points are enough to answer the most common questions asked in vivas (oral-examinations) or objectives. p.s : These tutorials will be based on DevC++ IDE and on Windows platform you can download DevC++ from here

Carbon Chemistry

                                     Carbon Chemistry Scientists continued their search for commercial and industrial applications of the tiny elongated molecular structures known as carbon nanotubes. Discovered in 1991, nanotubes consist of carbon atoms bonded together into graphitelike sheets that are rolled into tubes 10,000 times thinner than a human hair. Their potential applications range from tiny wires in a new generation of ultrasmall computer chips to biological probes small enough to be implanted into individual cells. Many of those uses, however, require attaching other molecules to nanotubes to make nanotube derivatives. In general, methods for making small amounts of derivatives for laboratory experimentation have required high temperatures and other extreme conditions that would be too expensive for industrial-scale production. During the year chemists from Rice University, Houston, Texas, and associates from the Russian Academy of Sciences, Moscow, described groun

Crown Wheel Preload

Crown Wheel Preload To achieve the low noise level, housing rigidity and accurate gear alignment are essential with a hypoid gear. This necessitates elimination of slackness in the crown wheel bearings by preloading. Out of the various methods used to measure the preload, the most common one is to measure the spread (outward deflection) of the bearing caps when the adjusters are screwed together. As an example, a preload cap-spread of 0.1 mm indicates that after preloading the side bearings, the distance between the bearing caps has increased by 0.1 mm.                                                                   Fig. 26.42. Final drive adjustment When shims are employed to control the backlash, the preload is obtained by increasing the shim thickness on each side of the crown wheel and the shims are added after the backlash has been set. Axles with this construction need a special tool to 'spread the caps' before the crown wheel assembly is removed or refitted. Figure 26.

Crown Wheel Adjustment

Crown Wheel Adjustment After setting the pinion, the crown wheel is installed in the assembly. The correct bearing cap must be used during this operation, as these are not interchangeable. Backlash is adjusted at this stage by moving the crown wheel towards or away from the pinion. Prior to the final measurement of backlash with a clock gauge, it is necessary to ensure that the crown wheel run-out is within the recommended limits. Meshing of the gear is checked by applying a smear of marking compound to the driving side of a few crown wheel teeth and then turning the pinion in the direction of rotation while applying a resistance to the crown wheel. The marking thus obtained indicates the mesh of the gears with respect to pinion position and backlash. Figure 26.41 illustrates the change, in relation to the correct marking, when the pinion position is changed.  A 'correct' marking indicates only a limited contact between the teeth under light-load test conditions. But if full lo


Differential When both rear wheels are connected to a common driving shaft rapid wear of\rear tyre, and difficulty in steering from the straight-ahead position are soon experienced. It can be seen in Fig. 26.43 that the outer wheel must travel a greater distance than the inner wheels during cornering of the vehicle. Hence, if the wheels are interconnected, the tyres have to 'scrub' over the road surface and tend to keep the vehicle moving straight ahead. These problems can be minimized by driving one wheel and allowing the other to run free. But this provides unbalanced driving thrust and unequal cornering speeds due to which the arrangement was not accepted. The problem was solved in 1827 by Pequeur of France who invented the differential. This mechanism rotates the wheels at different speeds, while maintaining a drive to both wheels. Example 26.4. The steering set of a, vehicle provides a turning-circle radius of 6.6 m with a wheel-track width of 1.2 m. The effective road whe


Castor Caster angle is the tilt of the king pin or ball joint centre line from the vertical towards either the front (negative caster) or rear (positive caster) of the vehicle (Fig. 27.15). The weight of automobile having positive castor tends to turn a wheel inward to allow the body to lower. Negative castor causes an outward turning effect. Wheel castor enables the driver to feel the straight ahead position so that he may steer in a straight path.     During cornering, a torque must be exerted on the steering wheel to overcome the self centring or castor action, which tends to keep the wheels pointing straight ahead. The castor angle produces a trailing effect and hence gives the directional stability. Incorrect castor can produce difficulties like hand steering, pulling to one side when brakes are applied and shimmy. To understand the action of this steering feature, the operation of a simple furniture castor (Fig. 27.15A) fitted to a trolley may be considered. Force acting on the t

Condition for True Rolling

Condition for True Rolling True rolling occurs only when<the direction of motion of the vehicle is perpendicular to the wheel axis (Fig. 27.22A), i.e. the wheel is subjected to forward force. When wheel is subjected to side force that acts parallel to the wheel axis, a true scrub action is produced (Fig. 27.24B).  When the wheel is subjected to both forward and side forces, the movement is compounded of true rolling and lateral distortion (Fig. 27.22C). This condition occurs when the wheels are being steered, i.e. the direction of motion is neither parallel nor perpendicular to the axis of rotation. On a circular path, true rolling condition occurs when the projected axes of several wheels all moving in different curved paths intersect at a single point called the instantaneous centre (Fig. 27.22D). When these projected axes do not intersect at a single point, a degree of tyre scrub results (Fig. 27.22E). Fig. 27.22. Road-wheel and tyre rolling conditions.  A. True-rolling. B. True


Cylinder On an internal combustion engine, a cylinder is the space in which the combustion takes place. It also houses the piston and connecting rod. By looking at an engine's cylinder block, you can tell what kind of engine the car has. If the cylinders are in a straight line, it's an inline engine. If there are two rows of cylinders facing each other at an angle, it's a V engine. It the cylinders are in two rows, but lying flat across from each other, it's a horizontally opposed or boxer engine. The number of cylinders, as well as their layout, tells you if the engine is an inline four, V8 or another type. Cylinders are also sometimes called bores


Crankshaft The crankshaft is a rod that is connected to the pistons in an engine. As the pistons move up and down due to combustion, they rotate the crankshaft. This rotational force travels down a car's drivetrain and eventually powers the car.


Clutch A clutch connects and disconnects the transmission from the engine, allowing the flow of energy to momentarily stop so the transmissions gears can be changed. In an automatic transmission, this happens without driver input. In a manual transmission, the clutch must be disengaged before the driver changes or selects a gear