Archive | July 3, 2013

15-Year-Old Girl Creates Thermoelectric Flashlight – Powered By Heat from Human Hand*

15-Year-Old Girl Creates Thermoelectric Flashlight – Powered By Heat from Human Hand*

Ann Makosinski, from British Columbia, a 15-year old tenth grade student at St. Michaels University School in Victoria, was among of thousands of ambitious kids from more than 100 countries participating in Google Science Fair project.

“If I can capture enough heat from a human hand and convert it efficiently to electricity,” she hypothesized, “then I can power a flashlight without any batteries or kinetic energy.”

“Using four Peltier tiles and the temperature difference between the palm of the hand and ambient air, I designed a flashlight that provides bright light without batteries or moving parts,” Makosinski said.

“My design is ergonomic, thermodynamically efficient, and only needs a five degree temperature difference to work and produce up to 5.4 mW at 5 foot candles of brightness.”

In order to create the flashlight, Makosinski measured how much electricity could be generated from the heat of a palm — about 57 milliwatts — and how much she needed to light the LED — about half a milliwatt.
She decided to use Peltier tiles.

“If one side of these tiles is heated, and the other is cooled, electricity is produced. For my flashlight, I would be heating one side with the palm, and cooling the other side of the tile with a heat sink.

I calculated that our bodies radiate 5.7 mW/cm2, but only 0.5 mW is needed to generate a bright light at the LED.

Both produced power, but only a few millivolts. I need 2.5 V ! I had to convert my DC input to AC, and then run it through a oscillator circuit with a stepup transformer. My final circuit had only 4 parts and produced a step up ratio of 100:1. So for 50 mV DC from the Peltiers I obtained 5 Volts AC which was sufficient to light the LED.

The final design included mounting the Peltiers on a hollow aluminum tube which was inserted in a larger PVC pipe with an opening that allowed ambient air to cool the tube. The palm wrapped around a cutout in the PVC pipe and warmed the tiles. The result was a bright light at 5 degree Celcius of Peltier differential.”

The flashlight worked!

I’m really interested in harvesting surplus energy, energy that surrounds but we never really use. This took quite awhile ’cause I had to do it during the school year as well and I had homework, plays, whatever that I was also doing,” she said.

The results proved Makosinski’ hypothesis, that even with all the thermal and voltage conversion losses, there was still enough power in the palm to provide usable light.

Two flashlights that she has created do not use any batteries, toxic chemicals, or kinetic energy. They do not create any noise or vibrations and will always work.

The flashlight’s only limitation is its need for at least a 5°C temperature difference to provide usable light.

Source*

Related Topics:  

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Who Said You Couldn’t Teach Yourself!*

The 12-yr-old Who Rocked the Earth Summit

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Youth Inventor Wins Environmental Award

12-Year Old Discovers Most Presidents Related to King John*

Necessity Says a Solar Car Instead of Israeli Oil

A Courageous School Girl Challenges the Personalized Electronic Tracking System

Against the Odds: Girl from Gaza Takes 1st International Math Prize*

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Eugenics: A Child with Four Biological Parents

Eugenics: A Child with Four Biological Parents!*

By David C. Jennings

Coming to a maternity ward near you, babies with the genes of 3 or 4 people!  The British government has said it’s full speed ahead for an in-vitro fertilization technique where the DNA of 2 ‘parents’ can be mixed into the donor egg of a third person. A second kind of procedure involves chromosomes from 2 men and 2 women to achieve the same result with more DNA in the mix. The bill is due to be debated in the House of Commons and voted on next year.

The legal excuse is a technique, known as ‘mitochondria replacement therapy’, which can only currently be used for research. Supporters of the procedure claim that it will stop genetic diseases from being passed down between mothers and their children through faulty mitochondria, structures which supply power to cells.

Put simply the faulty mitochondria would be replaced by those from another donor egg. Since these little power cells that spur the multiplication of eggs have their own DNA, it means a 3rd and in some cases 4th DNA’s are being introduced in the final product – a child.

But the far more serious concern is the altering of genetic structure of the babies. Aside from the endless debates about who the legal parents are, punctuated by court cases and interrupted by socially engineering child custody workers; concerns have to be raised that the technique will result in the permanent alteration of the human gene make-up, and any unexpected genetic problems will be passed down to future generations. More worrisome is scientists do not know what the effects will be, yet are prepared to go full steam ahead.

Currently when the two sets of genes come together from both parents one gene is more dominant than the other and wins – with the child taking on that characteristic. It’s not clear what will happen with a third gene set and what characteristics might be affected. We know from intra-family reproduction that genetic weaknesses are enhanced and dominate – it could be that the effect could gradually degrade the gene structure through generations.

Dr David King, director of campaign group Human Genetics Alert, said “It is a disaster that the decision to cross the line that will eventually lead to a eugenic designer baby market should be taken on the basis of an utterly biased and inadequate consultation.”

As Dr King points out this becomes the next fear in the slippery slope. Since the procedure is related to human cloning it is reasonable to believe some will take it beyond the 1 in 10,000 who are currently at risk for passing on the faulty mitochondria condition.

Not seemingly being considered, according to Dr Calum MacKella, is that the procedure likely needs aggressive hormonal treatments resulting in ovarian hyper stimulation. Approximately 5 per cent of In Vitro Fertilisation cycles cause moderate or severe symptoms which may result in disabling strokes or even, in very rare circumstances, the death of the woman.
Protecting the life of the mother is certainly paramount before conception so proper study should be done before anything happens as to the risk factor of killing the mother in the procedure versus the chance of the child dying without any procedure being performed.

Dr. Mackella also writes “Since the genome of future children is being intentionally modified through Maternal Spindle Transfer (3 person version) and Pronuclear Transfer (4 person version), both these procedures could be considered as eugenic practices. These are defined as strategies or decisions aimed at affecting, in a manner which is considered to be positive, the genetic heritage of a child, a community or humanity in general.”

Indeed the concept potentially takes us in the step of Aldous Huxley’s ‘Brave New World’. It should be called excessively foolish science since it takes us where no newborn has gone before with consequences that cannot be projected. But the government simply calls it a scientific advance, as Chancellor George Osborne prepares to lighten your wallet to pay for it.

Source*

Related Topics:

War on Faith and Family Continues

Giving Birth to a Child Artificially

Male Fertility on the Decline in Spain

Why Gene Therapy and Designated Genetic Disorders is Tinkering and not Science!

The Bright Blue-Eyed Chinese Boy Who Sees in the Dark!

Israeli Eugenics Program on Ethiopians*

Ma’afa: The Truth Behind Birth Control…

Birth Controling a Nation

The Spermicide in Your Food!?

Europe’s Population ‘Management’ Agenda in Yemen.

African-American Women and Childbirth

Bill Gates and Population Control