Tuesday 3 June 2014

Energy doors by moses dhilip kumar

ENERGY DOORS




ABSTRACT
Energy Doors – as the name suggests, doors that can produce electricity. The input is the human energy. The electricity produced can be stored in a battery or can be used directly to provide power to small electrical appliances.
There are two types of energy doors:
1.      Mechanical Energy Doors
2.      Electronic Energy Doors.
The energy door which has gears, flywheels, and an alternator is called mechanical energy doors. The energy door which has lightning piezoelectric components is called as electronic energy doors.
Mechanical Energy doors can be used in public places to produce electricity and electronic energy doors can be used in private buildings, as they produce more electricity than mechanical systems.
The door is connected to a mechanism which has either mechanical components or electronic components. When the door is opened or closed, the given human power, which causes the mechanical motion, is converted into electricity by the alternator or lightning piezoelectric component.
This energy door can be mainly used for powering lighting system using LED’s as they require only small amount of electricity. This reduces the electricity bill and mainly, it reduces the usage of fossil fuels used to produce electricity which cause pollution to the environment.
The main aim of the energy door is to save the environment by providing power using freely available human power without causing any pollution to the environment.
_________________________________________________________________________________________

INTRODUCTION:
Energy doors can produce electricity by converting small amounts of human energy into electricity. The electricity produced by the energy door can be used to power small electric devices or can be stored in a battery to use it later.




CONCEPT:
Every building in this world has doors. We humans operate the door using our energy. The door has two operations – open and close. The idea is to add another operation to the door to produce electricity, which utilizes the same human energy to produce electricity. keratuer-modern-entry-door-exclusivline.jpg


entrance_doors.jpg


CONSTRUCTION:
The energy door consists of the following parts:
1.     Ordinary door.
2.     Gear wheels.
3.     Flywheel.
4.     Connecting rod.
5.     Chain & Sprocket.
6.     Generator.
7.     Piezoelectric device.
8.     Battery.

ergon-two-way-door-3.jpg




MODEL OF ENERGY DOOR DESIGNED USING SOLIDWORKS
thumb_3000.jpg

2_thumb_3000.jpg

1_thumb_3000.jpg

1. DOOR:
The door can be of three types:
A.    Swinging door.
B.    Sliding door.
C.     Rotating door.

A.    Swing door is a simple door. In this, the door is connected to a mechanism by a connecting rod which is connected to a chain. The other end is attached with a sprocket which converts the sliding mechanism into rotating mechanism.  The sprocket is connected to gear wheels, which increases the speed of the rotating motion. The gear wheels are connected to a flywheel. The main use of a flywheel here is to make things easier. A slight force is enough from us; rest of the necessary force is provided by the flywheel.

oikos-tekno-doors-1.jpg
B.    Sliding door – also has the same mechanism as the swinging door.
bartels-designer-sliding-door.jpg


C.     Rotating door – In this there is no need of converting sliding motion into rotating motion. The gears and flywheel are connected directly to the main shaft of the door. The alternator or lightning piezoelectric component is also attached directly to the main shaft.
revolving-door-2.jpg


PIEZOELECTRIC COMPONENT:
Instead of using gears, flywheels & alternators to produce electricity. A piezoelectric component can be used to produce large amount electricity depending on the type of piezoelectric component.
Here, a Lightning piezoelectric component is used. This piezoelectric component is a special type which can produce more electricity when compared to ordinary piezoelectric materials. This lightning piezoelectric component is developed by NASA.
It works on a simple principle. A thin ceramic piezoelectric wafer is sandwiched between an aluminum sheet and a steel sheet and held together with LaRC-SI, an amorphous thermo­plastic adhesive with special properties created by NASA. The sandwich is heated in an autoclave, and the adhesive melts. When the sandwich cools, the adhe­sive bonds the parts together into one piezoelectric ele­ment. While they cool, the components of the element contract at different rates, since they are made of different materials. This differential shrinkage causes the element to warp in either a convex or concave shape, depending on which way it is oriented. The shrinking of the outside metal layers places the inside piezoelectric ceramic under mechanical stress. If the element is cantilevered by clamp­ing one side and then plucked, it reverberates like a diving board that has just ejected a diver.
This way, a small amount of mechanical energy can result in a relatively long period of electrical generation
pz.bmp
Lightning piezoelectric component

WORKING OF ENERGY DOORS:
The working procedure is simple. In swinging & sliding doors, the sliding motion is converted into rotating motion, which drives the alternator to produce electricity. In rotating doors, directly the rotating motion is converted into electricity.
Instead of using mechanical components, piezoelectric component can be used. In this the mechanical energy is directly converted into electricity with much more efficiently than the alternator.

APPLICATIONS:
·        The energy doors can be used in public places like hotels, shops, railway station, airport and in many public places.


800px-BIAL_check_in_counters.jpg



·        It can be used in private buildings in places like air-conditioned rooms like computer labs, library & etc…
446px-Bankfield_Museum_096.jpg
·        A piezoelectric energy doors can be best used in houses which produces larger amount of electricity.
Gingerbread_House_Essex_CT.jpg


·        The electricity generated by the energy door can be used stored or can be used to power LED lights which needs only small amount of electricity.
·        It can be used to directly power a camera in a door or for an electronic lock.
·        At last, but not the least, it reduces the pollution produced by fossil fuels for generating electricity to a little extent.
CONCLUSION:
The Energy doors will revolutionize the design of doors. Usage of many energy doors in a building can produce large amount of energy which can be used for powering the entire lighting systems, which reduces the electricity bill. And it has many other benefits than conventional doors.




Tuesday 30 July 2013

TOP MULTI EARNING COMPUTER millinors

HAI dear readers this is new  and interesting        top 5 multi nation earning companys


top no 5;








          google   
                      google company got top 5 'th place and this campany turn over 49.5 million dollars  and their tax amount is 2 million dollars
         and their profit amount  15.2 million dollers      

top no 4;

        ORACLE 

           oracle  company got 4 th place their turn over 29.74  and abroad investment i2.7 million and profit is 21.2 millions


top 3
         CISCO   
                  this casco is very huge amount turn over got comparing to previous twos
 and their turn over amount is 46.74 million dollars    their tax amount is 2 million dollars   


top   2

       
           DO U GUESS   which one is got second       yes    the great    MICRO SOFT   they got 2 nd place total amount 59.5 million dollars  and THEIR tax amount 3.5 million dollars


TOP 1    

APPLE  
         APPLE IS GOT NO 1 place because their turn over amount    110  million dollars    this is the high comparing      to above companys          ,,,,,,,,,congrats  apple              ..............




by moses 






Saturday 20 July 2013

DO U KNOW SHORTCUT ? BY MOSES DHILIP KUMAR

FNDS THIS SHORTCUTS REALLY VERRY USEFULL FOR UR COMPUTER WORKS..

Keyboard Shorcuts (Microsoft Windows)
1. CTRL+C (Copy)
2. CTRL+X (Cut)
3. CTRL+V (Paste)


4. CTRL+Z (Undo)
5. DELETE (Delete)
6. SHIFT+DELETE (Delete the selected item permanently without placing the item in the Recycle Bin)
7. CTRL while dragging an item (Copy the selected item)
8. CTRL+SHIFT while dragging an item (Create a shortcut to the selected item)
9. F2 key (Rename the selected item)
10. CTRL+RIGHT ARROW (Move the insertion point to the beginning of the next word)
11. CTRL+LEFT ARROW (Move the insertion point to the beginning of the previous word)
12. CTRL+DOWN ARROW (Move the insertion point to the beginning of the next paragraph)
13. CTRL+UP ARROW (Move the insertion point to the beginning of the previous paragraph)
14. CTRL+SHIFT with any of the arrow keys (Highlight a block of text)
SHIFT with any of the arrow keys (Select more than one item in a window or on the desktop, or select text in a document)
15. CTRL+A (Select all)
16. F3 key (Search for a file or a folder)
17. ALT+ENTER (View the properties for the selected item)
18. ALT+F4 (Close the active item, or quit the active program)
19. ALT+ENTER (Display the properties of the selected object)
20. ALT+SPACEBAR (Open the shortcut menu for the active window)
21. CTRL+F4 (Close the active document in programs that enable you to have multiple documents opensimultaneou sly)
22. ALT+TAB (Switch between the open items)
23. ALT+ESC (Cycle through items in the order that they had been opened)
24. F6 key (Cycle through the screen elements in a window or on the desktop)
25. F4 key (Display the Address bar list in My Computer or Windows Explorer)
26. SHIFT+F10 (Display the shortcut menu for the selected item)
27. ALT+SPACEBAR (Display the System menu for the active window)
28. CTRL+ESC (Display the Start menu)
29. ALT+Underlined letter in a menu name (Display the corresponding menu) Underlined letter in a command name on an open menu (Perform the corresponding command)
30. F10 key (Activate the menu bar in the active program)
31. RIGHT ARROW (Open the next menu to the right, or open a submenu)
32. LEFT ARROW (Open the next menu to the left, or close a submenu)
33. F5 key (Update the active window)
34. BACKSPACE (View the folder onelevel up in My Computer or Windows Explorer)
35. ESC (Cancel the current task)
36. SHIFT when you insert a CD-ROMinto the CD-ROM drive (Prevent the CD-ROM from automatically playing)

Dialog Box - Keyboard Shortcuts
1. CTRL+TAB (Move forward through the tabs)
2. CTRL+SHIFT+TAB (Move backward through the tabs)
3. TAB (Move forward through the options)
4. SHIFT+TAB (Move backward through the options)
5. ALT+Underlined letter (Perform the corresponding command or select the corresponding option)
6. ENTER (Perform the command for the active option or button)
7. SPACEBAR (Select or clear the check box if the active option is a check box)
8. Arrow keys (Select a button if the active option is a group of option buttons)
9. F1 key (Display Help)
10. F4 key (Display the items in the active list)
11. BACKSPACE (Open a folder one level up if a folder is selected in the Save As or Open dialog box)

Microsoft Natural Keyboard Shortcuts
1. Windows Logo (Display or hide the Start menu)
2. Windows Logo+BREAK (Display the System Properties dialog box)
3. Windows Logo+D (Display the desktop)
4. Windows Logo+M (Minimize all of the windows)
5. Windows Logo+SHIFT+M (Restorethe minimized windows)
6. Windows Logo+E (Open My Computer)
7. Windows Logo+F (Search for a file or a folder)
8. CTRL+Windows Logo+F (Search for computers)
9. Windows Logo+F1 (Display Windows Help)
10. Windows Logo+ L (Lock the keyboard)
11. Windows Logo+R (Open the Run dialog box)
12. Windows Logo+U (Open Utility Manager)
13. Accessibility Keyboard Shortcuts
14. Right SHIFT for eight seconds (Switch FilterKeys either on or off)
15. Left ALT+left SHIFT+PRINT SCREEN (Switch High Contrast either on or off)
16. Left ALT+left SHIFT+NUM LOCK (Switch the MouseKeys either on or off)
17. SHIFT five times (Switch the StickyKeys either on or off)
18. NUM LOCK for five seconds (Switch the ToggleKeys either on or off)
19. Windows Logo +U (Open Utility Manager)
20. Windows Explorer Keyboard Shortcuts
21. END (Display the bottom of the active window)
22. HOME (Display the top of the active window)
23. NUM LOCK+Asterisk sign (*) (Display all of the subfolders that are under the selected folder)
24. NUM LOCK+Plus sign (+) (Display the contents of the selected folder)

MMC COnsole Windows Shortcut keys

1. SHIFT+F10 (Display the Action shortcut menu for the selected item)
2. F1 key (Open the Help topic, if any, for the selected item)
3. F5 key (Update the content of all console windows)
4. CTRL+F10 (Maximize the active console window)
5. CTRL+F5 (Restore the active console window)
6. ALT+ENTER (Display the Properties dialog box, if any, for theselected item)
7. F2 key (Rename the selected item)
8. CTRL+F4 (Close the active console window. When a console has only one console window, this shortcut closes the console)

Remote Desktop Connection Navigation
1. CTRL+ALT+END (Open the Microsoft Windows NT Security dialog box)
2. ALT+PAGE UP (Switch between programs from left to right)
3. ALT+PAGE DOWN (Switch between programs from right to left)
4. ALT+INSERT (Cycle through the programs in most recently used order)
5. ALT+HOME (Display the Start menu)
6. CTRL+ALT+BREAK (Switch the client computer between a window and a full screen)
7. ALT+DELETE (Display the Windows menu)
8. CTRL+ALT+Minus sign (-) (Place a snapshot of the active window in the client on the Terminal server clipboard and provide the same functionality as pressing PRINT SCREEN on a local computer.)
9. CTRL+ALT+Plus sign (+) (Place asnapshot of the entire client window area on the Terminal server clipboardand provide the same functionality aspressing ALT+PRINT SCREEN on a local computer.)

Microsoft Internet Explorer Keyboard Shortcuts
1. CTRL+B (Open the Organize Favorites dialog box)
2. CTRL+E (Open the Search bar)
3. CTRL+F (Start the Find utility)
4. CTRL+H (Open the History bar)
5. CTRL+I (Open the Favorites bar)
6. CTRL+L (Open the Open dialog box)
7. CTRL+N (Start another instance of the browser with the same Web address)
8. CTRL+O (Open the Open dialog box,the same as CTRL+L)
9. CTRL+P (Open the Print dialog box)
10. CTRL+R (Update the current Web )

Friday 19 July 2013

pendrive password technics

கணணிப் பயன்பாட்டாளர்களிடையே Pen drive வைப் பயன்படுத்தாதவர்களே இருக்க முடியாது. என்ற நிலைஉருவாக்கி விட்டது ஆனால் அந்த Pen drive நம் கையில் இருக்கும் மட்டும் தான்அதில் இருக்கும் தகவலுக்குப் பாதுகாப்பு நாம் அதை எங்காவது மறந்து போய்விட்டு விட்டோம் என்றால் Pen drive எடுக்கும் எவரும் நமது Pen drive வில்
இருக்கும் தகவலை பார்கவோ அல்லது அதை Copy பண்ணி எடுக்கவோ முடியும்.
இதற்காக தற்போது imation போன்ற சில Pen drive தயாரிக்கும் நிறுவனங்கள் தாம் தயாரிக்கும் Pen drive க்கு Password போட்டு பாதுகாக்கக் கூடியவாறு அதனுடன்
சிறிய மென்பொருளையும் இணைத்து தருகிறார்கள் ஆனால் அந்த மென்பொருட்களை இந்த
வகை Pen drive களுக்கு மட்டும் தான் பயன்படுத்த முடிகிறது.

அப்ப மற்றவர்கள் என்ன பண்ண…………… ?
ஆமாம் அவர்களுக்காக உள்ள மென்பொருள் தான் Rohos Mini Drive இதன் முலம் Pen driveவின் ஒரு பகுதியை தனியாக Patition பண்ணி அந்த பகுதிக்கு Password கொடுக்க
முடியும்.

செயற்படுத்தும் முறை
முதலில் கீழ் உள்ள சுட்டியில் இருந்து மென்பொருளை தரவிறக்கிக் கொள்ளவும்.அந்த மென்பொருளை உங்கள் கணணியில் install பண்ணவும்.
மென்பொருளைத் தரவிறக்க : http://www.rohos.com/rohos_mini.exe
Pen drive கணணியில் இணைத்து விட்டு install பண்ணிய அந்த மென்பொருளை இயக்கவும்.
அதில் Setup USB key என்பதை Click செய்தவுடன் உங்கள் Pen drive பற்றிய தகவலை காட்டும் அதன் கீழ் Password கேட்பார்கள் .
அந்த தகவல் சரியாயில் அதில் நீங்கள் கொடுக்க விரும்பும் Password டைக் கொடுத்துவிட்டு Create disk ஐ கிளிக் செய்யவும்.
( அந்த தகவலில் ஏதேனும் பிழையிருப்பின் Change என்பதை கிளிக் செய்து தகவலை
மாற்றலாம் )
அது தானகவே உங்கள் Pen drive இன் ஒரு பகுதிக்கு Password போட்டு விடும் பின் உங்கள் pen drive ஐ கணணியில் இருந்து நீக்கிவிட்டு மீண்டும் இணைக்கவும்.
பின் கணணியில் இணைத்தவுடன் Pen drive வில் இருக்கும் Rohos mini.exe என்பதை Double click செய்து உங்கள் password கொடுத்து விட்டு My computer ஐ open பண்ணிப் பார்த்தால் புது Drive ஒன்று இருக்கும். அந்த Drive தான் நீங்கள் password கொடுத்திருக்கும் drive.
அதனுள் நீங்கள் பாதுகாக்க வேண்டிய File போட்டு வைத்துவிட வேண்டியது தான் மீண்டும்அந்தPassword போட்ட drive ஐ மூடுவதற்கு படத்தில் உள்ளது போல் உங்கள் taskbar இல் இருக்கும் அந்த Icon ஐ Right click செய்து Disconnect என்பதை Click செய்யவும்

2nd LAW OF THERMO DYNAMICS

thermodynamics is stated in two ways

1.kelvin planck statement
2.clausius statements

we sea full deatais below
1' kelvin planck statements
      it is impossible to construct an operating device working on a cyclic processs which produce no other effect then the extraction of energy as heat from a signal thermal reservoir and performs an equivelent amount of work     otherwise it is impossibleto construct an engineworking on  cyclic process which converts all the heat energy supplied into equivalent amount of useful work
     

DETECTING OF BOMBS USING NANOTECHNOLOGY By Moses dhilip kumar

 

                        DETECTING OF BOMBS 

                         USING

            NANOTECHNOLOGY

                            By

                     Moses dhilip kumar

     

 

 

ABSTRACT:

                              “ Bomb sniffing dogs today, nanotechnology tomorrow”

                             The challenges in transportation security, most notably air transport, evolve around detecting explosives before they reach their target, i.e. get on a plane for instance. The two technology-based methods of explosive detection are either nuclear-based (probing the screened object with highly penetrating radiation) or rely on trace detection. Trace detection techniques use separation and detection technologies, such as mass spectrometry, gas chromatography, chemical luminescence, or ion mobility spectrometry, to measure the chemical properties of vapor or particulate matter collected from passengers or luggage. All these methods require bulky and expensive equipment, costing hundreds of thousands of dollars apiece. This results in a situation where the effort and technology involved in the detection of explosives are orders of magnitude more expensive than the effort and costs incurred by terrorists in their deployment. Today, the cheapest, very reliable, and most mobile form of explosive detection is decidedly low-tech - dogs. The olfactory ability of dogs is sensitive enough to detect trace amounts of many compounds, which makes them very effective in screening objects. A dog can search an entire airport in a couple of hours. Using a chemical analysis machine would mean wiping down nearly every surface in the airport with a sterile cotton pad, then sticking those pads, one by one, into a computer for analysis. Given the recent advances of nanotechnology, researchers are now trying to develop the next generation of explosives sensors that are accurate, fast, portable and inexpensive – and don't need to be fed. In contrast to the currently used machines, dogs have the advantage of being relatively uncomplicated. "The [chemical analysis machines] that are used as an alternative to dogs are just extremely, unbelievably advanced and complex," says Rick Charles, an expert on aviation security at Georgia State University. "They involve things like ion mobility spectrometry – processes that literally do a molecular analysis of the contents of the container." The average bomb-sniffing dog may pee on a suitcase, but at least he won't lose his ability to sniff if someone bumps into him the wrong way. (quoted from an article in Salon "On the prowl with the secret bomb dogs")

 

 

INTRODUCTION:

                             The challenge of detecting explosives on people or objects is considerable: often there are only minute quantities available; there is a broad range of effective explosives that need to be screened for; all current detection technologies, including dogs, require close proximity to the person, package, or vehicle being screened. Among the major detection techniques, trace detection suffers from the fact that available vapor plumes are normally too dilute for detection at a distance. Another major drawback is that current explosives sensors are bulky and expensive and cannot be miniaturized (think of the screening gates at airports). Furthermore, the effectiveness of chemical trace analysis is highly dependent on three distinct              steps:

(1) sample collection,

(2) sample analysis, and

(3) comparison of results

 with known standards. If any of these steps is suboptimal, the test may fail to detect explosives that are present. These issues set the parameters for the design and development of nanotechnology-based, next generation bomb sniffing equipment. The goal in developing nanotechnology enabled sensors is to achieve reliable, extremely sensitive and inexpensive sensors (at least a thousand times cheaper than today's equipment) that can be mass produced and deployed in large enough numbers so that the cost of detection by law enforcement will be less than the cost of deployment by terrorists.

 

 

 

 

                          

PREPARATION:

                            One example of a next-generation nanotechnology explosives detector is a nanocomposite film that shows very fast fluorescence response to trace vapors of explosives such as TNT, DNT or NB. Developed by researchers in China, a silica film doped with nitrogen-containing macrocyclic molecules - porphyrins - shows a fluorescent response to even trace levels of explosives such as TNT .

Two key features of these mesostructured films, namely the porous structure and the large surface area, are believed to be principally responsible for the observed remarkable sensing performance.

 

                            SEM image of floppy diskette with traces of C-4 explosive

                                        PREPARATION OF NANOMATERIALS

 

 

 

The unique mesoporous structure provides a necessary condition for the facile diffusion of analytes to sensing elements, while the large surface area considerably enhances the interaction sites between analyte molecules and sensing elements, and thereby further improves the detection sensitivity.

 "Since the preparation is very easy, the used materials are inexpensive, organic sensing elements become stable enough in the inorganic matrix, and the synthesized sensing films are easily incorporated into inexpensive and portable electronic devices, this explored method should be a promising alternative to other developed explosive detection methods" says Guangtao Li from the Key Laboratory of Organic Optoelectronics & Molecular Engineering of the Ministry of Education at Tsinghua University, Beijing. Another chemical sensor approach is based on carbon nanotubes (CNTs). Developed at the NASA Ames Research Center, this platform provides an array of sensing elements where each sensor in the array consists of a CNT and an interdigitated electrode as a transducer. Due to the interaction between nanotube devices and gas molecules, the electron configuration is changed in the nanostructured sensing device, therefore, the changes in the electronic signal such as current or voltage can be observed. By measuring the conductivity change of the CNT device, the concentration of the chemical species, such as a certain type of molecule, can be measured.

Combined with MEMS technology, light weight and compact size sensors can be made in wafer scale with low cost. T http://www.nanowerk.com/spotlight/id1138.jpghis nanosensor technology can extend its application in civilian areas such as explosives detection, monitoring filter bed breakthroughs, personnel badge detectors, embedded suit hermiticity sensors, and other applications. Additionally, a wireless capability with the sensor chip can be used for networked mobile and fixed-site detection and warning systems for military bases, facilities and battlefield areas.

Portable, cheap and fast explosives detector built with nanotechnology :

 Due to the the increased use of modern bombs in terrorist attacks worldwide, where the amount of metal used is becoming very small, the development of a new approach capable of rapidly and cost-efficiently detecting volatile chemical emission from explosives is highly desirable and urgently necessary nowadays.
The trained dogs and physical methods such as gas chromatography coupled to a mass spectrometer, nuclear quadrupole resonance, electron capture detection as well as electrochemical approaches are highly sensitive and selective, but some of these techniques are expensive and others are not easily fielded in a small, low-power package. As a complementary method, however, chemical sensors provide new approaches to the rapid detection of ultra-trace analytes from explosives, and can be easily incorporated into inexpensive and portable microelectronic devices.

 http://upload.wikimedia.org/wikipedia/commons/d/d3/Nanosensor.JPG                                   
       TNT REPRESENTATION
 In comparison to conjugated-polymer based sensors, the fabrication of these hybrid films is very simple, the used materials are inexpensive, and the trapped organic sensing elements also become very stable in the inert silica matrix." Two key features of these mesostructured films, namely the porous structure and the large surface area, are believed to be principally responsible for the observed remarkable sensing performance. The unique mesoporous structure provides a necessary condition for the facile diffusion of analytes to sensing elements, while the large surface area considerably enhances the interaction sites between analyte molecules and sensing elements, and thereby further improves the detection sensitivity.                                        
                                                                     
                                                                            OLD METHOD
                                            
http://www.smartertechnology.com/images/stories/bombdevice.jpg                                                                      

                              


                                                                        NEW NANOMETHOD
 Nanosensor:
                         This is the most important component in this nano detecting device
Other projected products most commonly involve using nanosensors to build smaller integrated circuits, as well as incorporating them into various other commodities made using other forms of nanotechnology for use in a variety of situations including transportation, communication, improvements in structural integrity, and robotics. Nanosensors may also eventually be valuable as more accurate monitors of material states for use in systems where size and weight are constrained, such as in satellites and other aeronautic machines.
Existing nanosensors
Currently, the most common mass-produced functioning nanosensors exist in the biological world as natural receptors of outside stimulation. For instance, sense of smell, especially in animals in which it is particularly strong, such as dogs, functions using receptors that sense nanosized molecules. Certain plants, too, use nanosensors to detect sunlight; various fish use nanosensors to detect minuscule vibrations in the surrounding water; and many insects detect sex pheromones using nanosensors.
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Chemical sensors, too, have been built using nanotubes to detect various properties of gaseous molecules. Carbon nanotubes have been used to sense ionization of gaseous molecules while nanotubes made out of titanium have been employed to detect atmospheric concentrations of hydrogen at the molecular level. Many of these involve a system by which nanosensors are built to have a specific pocket for another molecule. When that particular molecule, and only that specific molecule, fits into the nanosensor, and light is shone upon the nanosensor, it will reflect different wavelengths of light and, thus, be a different color


 Production methods of nanosensors:
There are currently several hypothesized ways to produce nanosensors. Top-down lithography is the manner in which most integrated circuits are now made. It involves starting out with a larger block of some material and carving out the desired form. These carved out devices, notably put to use in specific microelectromechanical systems used as microsensors, generally only reach the micro size, but the most recent of these have begun to incorporate nanosized components.
Another way to produce nanosensors is through the bottom-up method, which involves assembling the sensors out of even more minuscule components, most likely individual atoms or molecules. This would involve moving atoms of a particular substance one by one into particular positions which, though it has been achieved in laboratory tests using tools such as atomic force microscopes, is still a significant difficulty, especially to do en masse, both for logistic reasons as well as economic ones. Most likely, this process would be used mainly for building starter molecules for self-assembling sensors.
http://upload.wikimedia.org/wikipedia/commons/thumb/5/55/DNA_nanostructures.png/300px-DNA_nanostructures.png
                                                       SIZE OF NANOSENSOR
(A) An example of a DNA molecule used as a starter for larger self-assembly. (B) An atomic force microscope image of a self-assembled DNA nanogrid. Individual DNA tiles self-assemble into a highly ordered periodic two-dimensional DNA nanogrid.


The third way, which promises far faster results, involves self-assembly, or “growing” particular nanostructures to be used as sensors. This most often entails one of two types of assembly. The first involves using a piece of some previously created or naturally formed nanostructure and immersing it in free atoms of its own kind. After a given period, the structure, having an irregular surface that would make it prone to attracting more molecules as a continuation of its current pattern, would capture some of the free atoms and continue to form more of itself to make larger components of nano sensors.











CONCLUSION:
                         The purpose of using nano-sensors in this device particularly to identify the bombs before reaching the airport and by using nanogrid is mainly to detect the bombs after it get sensed by the nanosensors.