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Messages - drkamruzzaman

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Good one..

Faculty Sections / Re: Smile to improve your mood
« on: July 08, 2015, 09:54:43 PM »
Its true.Thanks for sharing.

Informative post..

The 3D-printed car, easily configurable and made right before your eyes, is coming closer to reality.
A California-based company unveiled a prototype supercar that it says could dramatically reduce ‘‘the pollution, materials and capital costs’’ that go into their manufacture.
And next week, a Phoenix company says it is ready to unveil the design for its ‘‘road-ready’’ 3D-printed car. Last year, it showed a fairly crude version of a car and demonstrated the process of making it at a trade show in Las Vegas.
Both moves show progress toward a car that can be built as soon as the buyer’s preferences are programmed into the machine that then makes it out of carbon fiber.
Divergent Microfactories of San Francisco recently showed what it says is the world’s first 3D-printed supercar, the Blade. The company says it’s eco-friendly because uses a combination of aluminum joints and carbon fiber tubing to make the chassis in minutes, using less material. It is envisioned as having a 700-horsepower engine that uses either compressed natural gas or gasoline. Weighing only 1,400 pounds, it would be capable of zero to 60 mile per hour speeds in about two seconds.
The company says it plans to make a limited number of them in its own plant. Its founder portrays the company as being on the industry’s cutting edge.
‘‘We’ve developed a sustainable path forward for the car industry that we believe will result in a renaissance in car manufacturing, with innovative, eco-friendly cars like Blade being designed and built in microfactories around the world,’’ says Kevin Czinger, CEO of Divergent Microfactories.
Czinger says the goal would be create teams around the world that could built the car in their own ‘‘microfactories.’’
Local Motors, meanwhile, is taking its own approach.
CEO John ‘‘Jay’’ Rogers told USA TODAY last year that he plans to make 3D-printed cars made of carbon-fiber reinforced ABS plastic costing from $18,000 to $30,000. The roofless version he was showing, looking a bit like a carbon-fiber dune buggy, had 50 parts, instead of the thousands in modern cars.
A machine makes the chassis, body -- even the dashboard -- and the wheel, engine and controls are then attached. The process takes about 40 hours. It’s easy to make changes.

very useful post.

A team of researchers has created a new implantable drug-delivery system using nanowires that can be wirelessly controlled.

The nanowires respond to an electromagnetic field generated by a separate device, which can be used to control the release of a preloaded drug. The system eliminates tubes and wires required by other implantable devices that can lead to infection and other complications, said team leader Richard Borgens, Purdue University's Mari Hulman George Professor of Applied Neuroscience and director of Purdue's Center for Paralysis Research.

"This tool allows us to apply drugs as needed directly to the site of injury, which could have broad medical applications," Borgens said. "The technology is in the early stages of testing, but it is our hope that this could one day be used to deliver drugs directly to spinal cord injuries, ulcerations, deep bone injuries or tumors, and avoid the terrible side effects of systemic treatment with steroids or chemotherapy."

The team tested the drug-delivery system in mice with compression injuries to their spinal cords and administered the corticosteroid dexamethasone. The study measured a molecular marker of inflammation and scar formation in the central nervous system and found that it was reduced after one week of treatment. A paper detailing the results will be published in an upcoming issue of the Journal of Controlled Release and is currently available online.

The nanowires are made of polypyrrole, a conductive polymer material that responds to electromagnetic fields. Wen Gao, a postdoctoral researcher in the Center for Paralysis Research who worked on the project with Borgens, grew the nanowires vertically over a thin gold base, like tiny fibers making up a piece of shag carpet hundreds of times smaller than a human cell. The nanowires can be loaded with a drug and, when the correct electromagnetic field is applied, the nanowires release small amounts of the payload. This process can be started and stopped at will, like flipping a switch, by using the corresponding electromagnetic field stimulating device, Borgens said.

The researchers captured and transported a patch of the nanowire carpet on water droplets that were used used to deliver it to the site of injury. The nanowire patches adhere to the site of injury through surface tension, Gao said.

The magnitude and wave form of the electromagnetic field must be tuned to obtain the optimum release of the drug, and the precise mechanisms that release the drug are not yet well understood, she said. The team is investigating the release process.

The electromagnetic field is likely affecting the interaction between the nanomaterial and the drug molecules, Borgens said.

"We think it is a combination of charge effects and the shape change of the polymer that allows it to store and release drugs," he said. "It is a reversible process. Once the electromagnetic field is removed, the polymer snaps back to the initial architecture and retains the remaining drug molecules."

For each different drug the team would need to find the corresponding optimal electromagnetic field for its release, Gao said.

This study builds on previous work by Borgens and Gao. Gao first had to figure out how to grow polypyrrole in a long vertical architecture, which allows it to hold larger amounts of a drug and extends the potential treatment period. The team then demonstrated it could be manipulated to release dexamethasone on demand. A paper detailing the work, titled "Action at a Distance: Functional Drug Delivery Using Electromagnetic-Field-Responsive Polypyrrole Nanowires," was published in the journal Langmuir.

Other team members involved in the research include John Cirillo, who designed and constructed the electromagnetic field stimulating system; Youngnam Cho, a former faculty member at Purdue's Center for Paralysis Research; and Jianming Li, a research assistant professor at the center.

For the most recent study the team used mice that had been genetically modified such that the protein Glial Fibrillary Acidic Protein, or GFAP, is luminescent. GFAP is expressed in cells called astrocytes that gather in high numbers at central nervous system injuries. Astrocytes are a part of the inflammatory process and form a scar tissue, Borgens said.

A 1-2 millimeter patch of the nanowires doped with dexamethasone was placed onto spinal cord lesions that had been surgically exposed, Borgens said. The lesions were then closed and an electromagnetic field was applied for two hours a day for one week. By the end of the week the treated mice had a weaker GFAP signal than the control groups, which included mice that were not treated and those that received a nanowire patch but were not exposed to the electromagnetic field. In some cases, treated mice had no detectable GFAP signal.

Whether the reduction in astrocytes had any significant impact on spinal cord healing or functional outcomes was not studied. In addition, the concentration of drug maintained during treatment is not known because it is below the limits of systemic detection, Borgens said.

"This method allows a very, very small dose of a drug to effectively serve as a big dose right where you need it," Borgens said. "By the time the drug diffuses from the site out into the rest of the body it is in amounts that are undetectable in the usual tests to monitor the concentration of drugs in the bloodstream."

Polypyrrole is an inert and biocompatable material, but the team is working to create a biodegradeable form that would dissolve after the treatment period ended, he said.

The team also is trying to increase the depth at which the drug delivery device will work. The current system appears to be limited to a depth in tissue of less than 3 centimeters, Gao said.

Nanoparticles may be able to detect bacteria, extend food shelf life, add health benefits, or improve flavor, reports Discovery.
While nanotechnology does not involve any genetic manipulation,  many companies are keeping secret about their work their doing. While this can keep competitors off their trail, it can also make it difficult for regulatory agencies to manage risks and create laws for these emerging technologies.
Nonetheless, nanotechnology offers some exciting potential benefits for the quality and safety of our foods.
1. CONTAMINATION SENSOR: Flash a light to reveal the presence of E. coli bacteria.
2. ANTIMICROBIAL PACKAGING: Edible food films made with cinnamon or oregano oil, or nano particles of zinc, calcium other materials that kill bacteria.
3. IMPROVED FOOD STORAGE: Nano-enhanced barrier keeps oxygen-sensitive foods fresher.
Nano-encapsulating improves solubility of vitamins, antioxidants, healthy omega oils and other ‘nutraceuticals’.
5. GREEN PACKAGING: Nano-fibers made from lobster shells or organic corn are both antimicrobial and biodegradable.
6. PESTICIDE REDUCTION: A cloth saturated with nano fibers slowly releases pesticides, eliminating need for additional spraying and reducing chemical leakage into the water supply.
7. TRACKING, TRACING; BRAND PROTECTION: Nanobarcodes can be created to tag individual products and trace outbreaks.
8. TEXTURE: Food spreadability and stability improve with nano-sized crystals and lipids for better low-fat foods.
9. FLAVOR: Trick the tongue with bitter blockers or sweet and salty enhancers.
10. BACTERIA IDENTIFICATION AND ELIMINATION: Nano carbohydrate particles bind with bacteria so they can be detected and eliminated.

Textile Engineering / Nano Fabric Shirt
« on: July 08, 2015, 10:40:37 AM »
Nano fabrics, which are fabric manufactured using nanoparticles thus enhance clothing. There is a thin layer of zinc oxide nanoparticles used in the fabric that provides better protection from UV radiation. In some of the clothes the nanoparticles are in the form of little hairs or whiskers, which helps in repelling water and other materials hence make the clothes stain-resistant.

The main features of nano fabrics are:
•   Odour control
•   Outperforms conventional fabric treatments
•   Provides long-lasting protection
•   Extends the life of the fabric Retains fabric's natural softness
•   Allows fabric to breathe naturally
•   Dry Inside
•   Static Elemination
•   Coolest comfort.Resist stains
•   Mosquito Repellent
•   Sweat Resistant
•   Improves blood circulation
•   Protect from harmful ultra violet rays

Very useful post.

Teaching & Research Forum / Batteries That Operate With Any Liquid
« on: July 08, 2015, 10:16:22 AM »
Chungpin Liao, a professor at the Graduate School of Electro-Optic and Material Science of National Formosa University in Taiwan has invented an organic battery that creates electricity when wet.
The "organic" battery generates a charge within 10 seconds and will last anywhere from two days to a week depending on the liquid. It works with water, beverages or even urine.
Although it will only produce half the strength of traditional batteries, the organic battery has a storage capacity greater than water-powered fuel cells and is very cheap to manufacture.
Plus it contains no toxic substances and does not pose an environmental hazard" says Chungpin.
Liao received his degree in nuclear engineering from National Tsing Hua University in Hsinchu, Taiwan. He earned his Masters and Ph.D degrees in plasma science and fusion technology from the Massachusetts Institute of Technology in Cambridge, United States.


Teaching & Research Forum / Water Drop Lens
« on: July 08, 2015, 10:14:58 AM »
Physicist and inventor, Bruno Berge, has created a liquid optical lens.
Using a process known as electro-wetting, a water drop is deposited on a metal substrate and covered by a thin insulating layer. When a voltage is applied to the metal, it modifies the angle of the liquid drop.
The liquid lens is comprised of two liquids, water and oil, one is a conductor while the other is an insulator. A variation in the voltage causes a change to the curvature of the liquid to liquid interface, which changes the focal length of the lens.
The use of liquids allows for low cost construction. There are no moving parts and electrical consumption is extremely low. The lens has a large inverse focal length range, quick response, high optical quality and can operate in a wide temperature range.


Teaching & Research Forum / Glass Nanobots Absorb Toxins
« on: July 08, 2015, 10:13:33 AM »
A nanobot particle made from glass is being developed that can absorb pollutants from contaminated water.
The glass particles act like sponges by attracting and binding contaminants to themselves and expanding eight times in size during the process.
But unlike a sponge, these nanobots are hydrophobic, meaning they don't absorb water.
Scientists claim this new technology could be used to clean petroleum spills or other hazardous chemicals from our waterways. After the particles are dropped into the water, they collect pollutants and then rise to the surface when fully expanded. The particles are then skimmed from the surface, cleaned and placed back into the water to repeat the process.


Teaching & Research Forum / Three Dimensional Printing
« on: July 08, 2015, 10:11:10 AM »
Inventors Max Bogue and Peter Dilworth have invented a unique pen that draws in the air.

A colorful spool of plastic thread is fed into the pen.

The thread is then extruded as heated plastic that cools and solidifies instantly as it exits the tip.

This allows solid 3D structures to be drawn on any surface or from any surface into the air.

The pen, called a 3Doodler, weights approximately 7 ounces (198 g) and is 7 inches (17.7 cm) long. It requires no technical knowledge or software and plugs into an electrical outlet.

Max and Peter have received over 2.2 million dollars worth of advanced orders for their three dimensional printing pen.
- See more at:

Teaching & Research Forum / Re: Thinking Skill: Critical Thinking
« on: July 08, 2015, 10:01:25 AM »
Interesting post...

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