শনিবার, ৫ জানুয়ারী, ২০১৩

Genetic Counselor - HigherEdJobs

Position Description: University of Colorado Denver
Exempt Professional - Genetic Counselor
Clinical Genetics and Metabolism / Department of Pediatrics / SOM
Job Posting # 820300, Position #702636

The section of Clinical Genetics and Metabolism in the Department of Pediatrics has an opening for a full-time Genetic Counselor to work at the Anschutz Medical Campus in Aurora. The Section of Clinical Genetics and Metabolism provides integrated genetics services to the population in the State of Colorado and surrounding states and develops nationally reknown innovative care for the future through its research programs.

The University of Colorado Denver is seeking nominations and applications for the position of Genetic Counselor. UC Denver is the premier research university in Colorado, serving more than 30,000 undergraduate, graduate and health professions students in Denver, Aurora and online and awarding nearly 4,000 degrees each year. The renowned researchers and award-winning faculty of UC Denver offer more than 100 degree programs through 13 colleges and schools. In 2008 the University was awarded more than $371 million in research grants and contracts. The new Anschutz Medical Campus includes over 5 million square feet of research, educational and clinical space on 227 acres. The Downtown Campus is located in one of America's most vibrant urban centers, just steps from the Denver Center for Performing Arts, the LoDo District and the state capitol. On both campuses, students, staff and faculty have access to a broad array of academic, professional, community, recreational and cultural opportunities.

The University of Colorado Denver is committed to recruiting and supporting a diverse student body, faculty and administrative staff. The university strives to promote a culture of inclusiveness, respect, communication and understanding.

Job Responsibilities:
The genetic counselor will provide clinical care in the professional area of genetic counseling to patients in the genetics both the inpatient and outpatient setting. The position is located on the Anschutz Medical Campus in the clinical offices of the Section of Clinical Genetics and Metabolism.

Additional Posting Description: Examples of Work Performed

  • Clinical Genetic Counseling
  • Obtain and evaluate family history and other pertinent medical and psychosocial information as appropriate to given patient and clinic requirements.
  • Assist with the evaluation of patient information and history for determination of risk for a genetic disorder and appropriate course for genetic testing.
  • Determine current knowledge regarding specific diagnoses, including modalities of testing, treatment options, and genetic basis.
  • Ensure that patients and/or family understand implications, risks, and benefits of genetic testing should testing be indicated. Coordinate testing as needed.
  • Counsel patients and families regarding the biochemistry, genetics, natural history, and management of a given diagnosis and be able to convey this information in written and verbal format.
  • Convey complex genetic information, test results, and address the emotional impact of such information to patients and families, both in person and by telephone, using understandable terminology and knowledge of genetic and psychosocial principles.
  • Coordinate provision of direct patient care to individuals and families with genetic disorders.
  • Participate in the development and maintenance of clinic standard of care practices for genetic disorders.
  • Serve as an educator and resource person to other health care providers and to the general public regarding genetic disorders.
  • Participate in the education and supervision of graduate genetic counseling students, medical genetic residents, rotating medical students, and rotating pediatric residents.
  • Identify medical literature pertinent to patient evaluations by utilizing genetics and medical databases and other library resources. Read and abstract relevant medical information from journal articles and medical texts. Compare specific patient information to previously reported cases to identify a patient's diagnosis or potential diagnosis.
  • Writing study documents
Knowledge, Skills, and Abilities
  • Knowledge of principles of genetics, inborn errors of metabolism, and genetic counseling.
  • Knowledge of standard inpatient and outpatient clinical operations and procedures.
  • Ability to develop and present educational information to patients as well as to professionals.
  • Ability to provide genetic, medical, and technical information in a comprehensive, understandable, nondirective manner to patients and families.
  • Ability to work independently as well as serving as a team member.
  • Ability to gather data and prepare reports.
  • Skilled in communication, both oral and written.
  • Skilled in establishing priorities.
  • May require ability to travel via car and/or airplane.
  • Obtain and maintain IRB certification.
  • Knowledge of principles of clinical research and willingness to learn skills for grant writing
Required Education/Experience/Skills (Minimum Qualifications): Masters in genetic counseling.
Board certification or board eligibility in genetic counseling.
Experience of direct involvement in research.

Desired Qualifications: Pediatric experience a plus
Experience with IRB review
Experience with research in Inborn Errors of Metabolism
Experience in writing research proposals

Special Instructions to Applicants: The salary for this position has been established at $54,000 to $67,000; commensurate with experience. The University of Colorado offers a full benefits package. Information on University benefits programs, including eligibility, is located at https://www.cu.edu/pbs/.

Applications are accepted electronically at www.jobsatcu.com, reference Job Posting 820300

Review of applications will begin 01/21/2013, and continue until position is filled.

Required Application Materials:
When applying at www.jobsatcu.com, applicants must include:
1. A letter of application which specifically addresses the job requirements and outlines qualifications
2. A current CV/resume
3. The names, addresses, daytime telephone numbers and e-mail addresses for three professional references
4. Letters of reference (optional)

Questions should be directed to Dolores Rogers at Dolores.Rogers@childrenscolorado.org

UCD is dedicated to ensuring a safe and secure environment for our faculty, staff, students and visitors. To assist in achieving that goal, we conduct background investigations for all prospective employees. Some positions may require a financial/credit check and/or a motor vehicle report.

The University of Colorado strongly supports the principle of diversity. We encourage applications from women, ethnic minorities, persons with disabilities and all veterans. The University of Colorado is committed to diversity and equality in education and employment.

Please be advised that the University does check references as part of the employment process, and selection committee members may choose to contact work references during the search process other than those listed in your application.

The Immigration Reform and Control Act requires that verification of employment eligibility be documented for all new employees by the end of the third day of work. Alternative formats of this ad are available upon request for persons with disabilities.

The University of Colorado is committed to diversity and equality in education and employment.

Source: http://www.higheredjobs.com/details.cfm?JobCode=175706874

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শুক্রবার, ৪ জানুয়ারী, ২০১৩

Gene variant linked to active personality traits also linked to human longevity

Jan. 3, 2013 ? A variant of a gene associated with active personality traits in humans seems to also be involved with living a longer life, UC Irvine and other researchers have found.

This derivative of a dopamine-receptor gene -- called the DRD4 7R allele -- appears in significantly higher rates in people more than 90 years old and is linked to lifespan increases in mouse studies.

Robert Moyzis, professor of biological chemistry at UC Irvine, and Dr. Nora Volkow, a psychiatrist who conducts research at the Brookhaven National Laboratory and also directs the National Institute on Drug Abuse, led a research effort that included data from the UC Irvine-led 90+ Study in Laguna Woods, Calif. Results appear online in The Journal of Neuroscience.

The variant gene is part of the dopamine system, which facilitates the transmission of signals among neurons and plays a major role in the brain network responsible for attention and reward-driven learning. The DRD4 7R allele blunts dopamine signaling, which enhances individuals' reactivity to their environment.

People who carry this variant gene, Moyzis said, seem to be more motivated to pursue social, intellectual and physical activities. The variant is also linked to attention-deficit/hyperactivity disorder and addictive and risky behaviors.

"While the genetic variant may not directly influence longevity," Moyzis said, "it is associated with personality traits that have been shown to be important for living a longer, healthier life. It's been well documented that the more you're involved with social and physical activities, the more likely you'll live longer. It could be as simple as that."

Numerous studies -- including a number from the 90+ Study -- have confirmed that being active is important for successful aging, and it may deter the advancement of neurodegenerative diseases, such as Alzheimer's.

Prior molecular evolutionary research led by Moyzis and Chuansheng Chen, UC Irvine professor of psychology & social behavior, indicated that this "longevity allele" was selected for during the nomadic out-of-Africa human exodus more than 30,000 years ago.

In the new study, the UC Irvine team analyzed genetic samples from 310 participants in the 90+ Study. This "oldest-old" population had a 66 percent increase in individuals carrying the variant relative to a control group of 2,902 people between the ages of 7 and 45. The presence of the variant also was strongly correlated with higher levels of physical activity.

Next, Volkow, neuroscientist Panayotis Thanos and their colleagues at the Brookhaven National Laboratory found that mice without the variant had a 7 percent to 9.7 percent decrease in lifespan compared with those possessing the gene, even when raised in an enriched environment.

While it's evident that the variant can contribute to longevity, Moyzis said further studies must take place to identify any immediate clinical benefits from the research. "However, it is clear that individuals with this gene variant are already more likely to be responding to the well-known medical adage to get more physical activity," he added.

First author Deborah Grady, Maria Corrada, Valentina Ciobanu, Alexandra Moyzis, Chuansheng Chen and Dr. Claudia Kawas of UC Irvine; Diana Shustarovich and Gene-Jack Wang of Brookhaven; David Grandy of Oregon Health & Science University; Marcelo Rubinstein of Argentina's National Scientific & Technical Research Council; and Qi Dong of Beijing Normal University also contributed to the study, which was supported by the U.S. Department of Energy, the National Institute on Aging, and the National Institute on Alcohol Abuse & Alcoholism intramural program.

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Story Source:

The above story is reprinted from materials provided by University of California - Irvine.

Note: Materials may be edited for content and length. For further information, please contact the source cited above.


Journal Reference:

  1. D. L. Grady, P. K. Thanos, M. M. Corrada, J. C. Barnett, V. Ciobanu, D. Shustarovich, A. Napoli, A. G. Moyzis, D. Grandy, M. Rubinstein, G.-J. Wang, C. H. Kawas, C. Chen, Q. Dong, E. Wang, N. D. Volkow, R. K. Moyzis. DRD4 Genotype Predicts Longevity in Mouse and Human. Journal of Neuroscience, 2013; 33 (1): 286 DOI: 10.1523/JNEUROSCI.3515-12.2013

Note: If no author is given, the source is cited instead.

Disclaimer: This article is not intended to provide medical advice, diagnosis or treatment. Views expressed here do not necessarily reflect those of ScienceDaily or its staff.

Source: http://feeds.sciencedaily.com/~r/sciencedaily/~3/Rj_SO25pTTI/130103151515.htm

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The custom-built "roleplay" system was designed and implemented by Eric Martindale as of July 2009. All attempts to replicate or otherwise emulate this system and its method of organizing roleplay are strictly prohibited without his express written and contractual permission; violators will be prosecuted to the fullest extent of the law.

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Analysis: Geithner's planned departure puts Obama in tough spot

WASHINGTON (Reuters) - Treasury Secretary Timothy Geithner's plans to leave near the end of January put the White House in a tricky spot, depriving the Obama administration of its longest-serving economic adviser for its next fiscal showdown with Congress.

Geithner, who spent his years as Treasury secretary battling the financial crisis and then fighting with Republican lawmakers in 2011 over raising the U.S. debt ceiling, has wanted to leave government service for some time.

The Treasury Department said Geithner "has previously stated that he plans to be at Treasury until around" the January 21 inauguration.

The department said it did not plan to make any further announcements about the timing of Geithner's departure until after his successor is named. Bloomberg News reported that Geithner would leave at the end of January.

Obama chose Geithner to lead the just-ended negotiations with Congress to avert the December 31 fiscal cliff of spending cuts and tax hikes that threatened to push the economy back into recession.

But the deal, which preserved most of the Bush-era tax breaks for Americans, sets up a series of crucial fiscal deadlines by delaying automatic spending cuts until March 1 and not increasing the government's borrowing limit.

That puts Obama in the tough spot of nominating another Treasury secretary and asking the Senate to approve his choice when lawmakers are in the middle of another budget battle.

"The confirmation process will be nasty regardless as it will be a referendum on Obama's economic and deficit plans," said Chris Krueger, a policy analyst with Guggenheim Partners.

Geithner has already resorted to using emergency measures in order to give the Treasury Department the ability to pay government bills and avoid a damaging debt default.

The country hit its $16.4 trillion debt limit December 31, and the Treasury is on track to run out of funds in February. If Congress does not raise the debt ceiling on time, the United States would default on its debt payments and roil markets worldwide.

"From a confidence standpoint, you don't want to change the man at the top during a crisis," said Ward McCarthy, chief financial economist at Jefferies & Co in New York, adding that Geithner could still provide guidance as an adviser after he leaves.

Lawmakers are at war with each other over the size of government, and Republicans plan to use the debt ceiling increase to extract massive spending cuts from Democrats. And Geithner had managed to win the respect of Republican lawmakers, especially in the volatile House of Representatives.

FILLING THE VOID

Geithner was instrumental in helping Republican President George W. Bush and then Obama fight the 2007-09 credit crisis, first as the president of the New York Federal Reserve Bank and then as Obama's only Treasury secretary.

He survived calls for his resignation over how the Treasury handled the $700 billion Troubled Asset Relief Program bank bailout fund. He fought with Republican lawmakers over raising the debt ceiling in 2011.

As he tried to resign, Obama asked him to stay through the November presidential election.

Obama's chief of staff, Jack Lew, is widely expected to be chosen to replace Geithner. But a number of key Republicans do not like working with Lew, the former budget director, which could potentially exacerbate the raw relations between the administration and Congress.

"Geithner's leadership and expertise would undoubtedly be a tremendous asset to the president and the country as we confront this next challenge," said Max Baucus, the Democratic chairman of the Senate Finance Committee, which is in charge of vetting the next treasury secretary.

It is not clear who Obama would choose to lead negotiations for the next set of fiscal deadlines. Vice President Joe Biden, who helped broker the fiscal cliff deal, or Rob Nabors, the White House's main liaison to Congress, could fit that bill.

"That is a lot of experience and steadiness that you would be getting rid of," said Steve Bell, a former Senate budget committee staff director who is now an economic policy director with the Bipartisan Policy Center.

(This story has been corrected to clarify that Treasury referenced a prior statement about Geithner's departure timeline)

(Reporting By Rachelle Younglai; Editing by Leslie Adler)

Source: http://news.yahoo.com/analysis-geithners-planned-departure-puts-obama-tough-spot-032128309--business.html

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Superfood Detox & Pilates/Yoga February Day Workshop | Edible ...

Posted by Edible Goddess on January 2, 2013 ? Leave a Comment?

Bethanne creating a tasty sweet green drink for vitality at the Superfood Detox Day Workshop Aug 2012

Holistic Nutrition Detox Classes + Body-Slimming Pilates

Join Bethanne and Amber Zuckswert for an exceptional day detoxifying your body temple and lightening up so you feel and look like the absolute best & healthiest version of you! Dedicate this time to yourself and receive a heaping therapeutic dose of what you need to up-level your health.

You?ll enjoy a superfood nutrition education classes, demonstrations with revitalizing raw foods, nutrient-rich superfoods, herbal tonics & beauty elixirs AND a thorough training in body-slimming Pilates and yoga.

By the end of our time together, you?ll be very confident in knowing how to squash those unhealthy cravings that leave you feeling less than the best ever. You?ll have the support of the group and 2 teachers that have transformed their entire lives & bodies.

Work your booty & core with international trainer & Pilates pro, Amber Zuckswert

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Come ready to challenge yourself with a whole body workout designed to develop core strength & promote a long, lean appearance!

All fitness levels welcome.

When: Saturday 2/2/2013 at 1-7pm

Where: The Homestead Valley Community Association; 315 Montford Ave, Mill Valley, CA 94941. There is a parking lot and plenty of street parking in the beautiful neighborhood!

Investment: $150; food included (you will be fed well)

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Filed under Classes and Workshops, Cleansing & Detoxification, Cutting Edge Health Strategies, Edible Goddess, Empowerment & Inspiration, Featured Articles, Fresh Vegetable Juicing, Group Detox Programs, Raw Food Recipes, Raw Foods, Raw Superfood Recipes, Superfoods, Vita-Mix ? Tagged with Amber Zuckswert, Beauty Elixirs, cleanse, Cleansing & Detoxification, detox, epicself, Fitness, Green Smoothies, Herbal Tonics, Holistic Health, Holistic Nutrition, Marin County, Pilates, Raw food, Raw Vegan Cleanse, Superfood Detox, superfood nutrition, Superfoods, Weight Loss, yoga

About Edible Goddess
Bethanne Wanamaker is the founder of Edible Goddess, Creator of the Chocolate Goldies, and co-author of Superfood Beauty Elixirs. She lives to inspires you to become the absolute best and healthiest expression of yourself! As a certified holistic nutrition educator, natural beauty & conscious lifestyle expert, and motivational health speaker, she teaches others how to activate their highest potential. Learn more about the self-care practices that accelerate positive self-transformation at her classes, events and retreats.

Source: http://ediblegoddess.com/2013/01/february2013-superfood-detox/

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বৃহস্পতিবার, ৩ জানুয়ারী, ২০১৩

Microsoft Buys R2 Studios - Business Insider

Blake Krikorian, the hardware entrepreneur, quit Amazon's board of directors on Monday to join a mysterious competitor. We now know its name: Microsoft.

Microsoft reportedly bought Krikorian's latest startup, a home-automation company called id8 Group R2 Studios.

Krikorian is best known as the guy behind Sling Media and the Slingbox, a device which rebroadcast signals from a TV in your living room to a laptop or smartphone.

When Krikorian gave notice that he was leaving Amazon, Amazon said it was due to the sale of his startup and that he was taking a role with the company that bought it. But it didn't reveal who the mysterious buyer was.

Wall Street Journal reporters Jessica Lessin and Shira Ovide are now reporting that Microsoft bought R2 Studios for an undisclosed sum. In addition to getting Krikorian to join Microsoft, Redmond is also getting some patents. R2 Studios was working on some super secret tech around displaying digital content on TVs and doing mobile home automation.?

Last year, it released an app that let Android phones control home lightiing and heating, the Wall Street Journal reports.

R2 Studios also reportedly had lots of suitors besides Microsoft, including Google and Apple.

Home automation is becoming a hot area for tech companies. For instance, former Apple executive Tony Fadell made waves with his startup, Nest Labs. Nest produces a smart thermostat controlled with a mobile phone.?

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Source: http://www.businessinsider.com/microsoft-buys-r2-studios-2013-1

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Research update: Jumping droplets help heat transfer

Research update: Jumping droplets help heat transfer [ Back to EurekAlert! ] Public release date: 3-Jan-2013
[ | E-mail | Share Share ]

Contact: Sarah McDonnell
s_mcd@mit.edu
617-253-8923
Massachusetts Institute of Technology

CAMBRIDGE, MA -- Many industrial plants depend on water vapor condensing on metal plates: In power plants, the resulting water is then returned to a boiler to be vaporized again; in desalination plants, it yields a supply of clean water. The efficiency of such plants depends crucially on how easily droplets of water can form on these metal plates, or condensers, and how easily they fall away, leaving room for more droplets to form.

The key to improving the efficiency of such plants is to increase the condensers' heat-transfer coefficient a measure of how readily heat can be transferred away from those surfaces, explains Nenad Miljkovic, a doctoral student in mechanical engineering at MIT. As part of his thesis research, he and colleagues have done just that: designing, making and testing a coated surface with nanostructured patterns that greatly increase the heat-transfer coefficient.

The results of that work have been published in the journal Nano Letters, in a paper co-authored by Miljkovic, mechanical engineering associate professor Evelyn Wang, and five other researchers from the Device Research Lab (DRL) in MIT's mechanical engineering department.

On a typical, flat-plate condenser, water vapor condenses to form a liquid film on the surface, drastically reducing the condenser's ability to collect more water until gravity drains the film. "It acts as a barrier to heat transfer," Miljkovic says. He and other researchers have focused on ways of encouraging water to bead up into droplets that then fall away from the surface, allowing more rapid water removal.

"The way to remove the thermal barrier is to remove [the droplets] as quickly as possible," he says. Many researchers have studied ways of doing this by creating hydrophobic surfaces, either through chemical treatment or through surface patterning. But Miljkovic and his colleagues have now taken this a step further by making scalable surfaces with nanoscale features that barely touch the droplets.

The result: Droplets don't just fall from the surface, but actually jump away from it, increasing the efficiency of the process. The energy released as tiny droplets merge to form larger ones is enough to propel the droplets upward from the surface, meaning the removal of droplets doesn't depend solely on gravity.

Other researchers have worked on nanopatterned surfaces to induce such jumping, but these have tended to be complex and expensive to manufacture, usually requiring a clean-room environment. Those approaches also require flat surfaces, not the tubing or other shapes often used in condensers. Finally, prior research has not tested the enhanced heat transfer predicted for these types of surfaces.

In a paper published early in 2012, the MIT researchers showed that droplet shape is important to enhanced heat transfer. "Now, we've gone a step further," Miljkovic says, "developing a surface that favors these kinds of droplets, while being highly scalable and easy to manufacture. Furthermore, we've actually been able to experimentally measure the heat-transfer enhancement."

The patterning is done, Miljkovic says, using a simple wet-oxidation process right on the surface that can be applied to the copper tubes and plates commonly used in commercial power plants.

The nanostructured pattern itself is made of copper oxide and actually forms on top of the copper tubing. The process produces a surface that resembles a bed of tiny, pointed leaves sticking up from the surface; these nanoscale points minimize contact between the droplets and the surface, making release easier.

Not only can the nanostructured patterns be made and applied under room-temperature conditions, but the growth process naturally stops itself. "It's a self-limiting reaction," Miljkovic says, "whether you put it in [the treatment solution] for two minutes or two hours."

After the leaflike pattern is created, a hydrophobic coating is applied when a vapor solution bonds itself to the patterned surface without significantly altering its shape. The team's experiments showed that the efficiency of heat transfer using these treated surfaces could be increased by 30 percent, compared to today's best hydrophobic condensing surfaces.

That means, Miljkovic says, that the process lends itself to retrofitting thousands of power plants already in operation around the world. The technology could also be useful for other processes where heat transfer is important, such as in dehumidifiers and for heating and cooling systems for buildings, the authors say.

Challenges for this approach remain, Miljkovic says: If too many droplets form, they can "flood" the surface, reducing its heat-transfer ability. "We are working on delaying this surface flooding and creating more robust solutions that can work well [under] all operating conditions," he says.

The research team also included postdocs Ryan Enright and Youngsuk Nam and undergraduates Ken Lopez, Nicholas Dou and Jean Sack, all of MIT's mechanical engineering department.

###

The work was supported by MIT's Solid-State Solar Thermal Energy Conversion Center, the U.S. Department of Energy, the National Science Foundation and the Irish Research Council for Science, Engineering and Technology.

Written by David Chandler, MIT News Office


[ Back to EurekAlert! ] [ | E-mail | Share Share ]

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AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert! system.


Research update: Jumping droplets help heat transfer [ Back to EurekAlert! ] Public release date: 3-Jan-2013
[ | E-mail | Share Share ]

Contact: Sarah McDonnell
s_mcd@mit.edu
617-253-8923
Massachusetts Institute of Technology

CAMBRIDGE, MA -- Many industrial plants depend on water vapor condensing on metal plates: In power plants, the resulting water is then returned to a boiler to be vaporized again; in desalination plants, it yields a supply of clean water. The efficiency of such plants depends crucially on how easily droplets of water can form on these metal plates, or condensers, and how easily they fall away, leaving room for more droplets to form.

The key to improving the efficiency of such plants is to increase the condensers' heat-transfer coefficient a measure of how readily heat can be transferred away from those surfaces, explains Nenad Miljkovic, a doctoral student in mechanical engineering at MIT. As part of his thesis research, he and colleagues have done just that: designing, making and testing a coated surface with nanostructured patterns that greatly increase the heat-transfer coefficient.

The results of that work have been published in the journal Nano Letters, in a paper co-authored by Miljkovic, mechanical engineering associate professor Evelyn Wang, and five other researchers from the Device Research Lab (DRL) in MIT's mechanical engineering department.

On a typical, flat-plate condenser, water vapor condenses to form a liquid film on the surface, drastically reducing the condenser's ability to collect more water until gravity drains the film. "It acts as a barrier to heat transfer," Miljkovic says. He and other researchers have focused on ways of encouraging water to bead up into droplets that then fall away from the surface, allowing more rapid water removal.

"The way to remove the thermal barrier is to remove [the droplets] as quickly as possible," he says. Many researchers have studied ways of doing this by creating hydrophobic surfaces, either through chemical treatment or through surface patterning. But Miljkovic and his colleagues have now taken this a step further by making scalable surfaces with nanoscale features that barely touch the droplets.

The result: Droplets don't just fall from the surface, but actually jump away from it, increasing the efficiency of the process. The energy released as tiny droplets merge to form larger ones is enough to propel the droplets upward from the surface, meaning the removal of droplets doesn't depend solely on gravity.

Other researchers have worked on nanopatterned surfaces to induce such jumping, but these have tended to be complex and expensive to manufacture, usually requiring a clean-room environment. Those approaches also require flat surfaces, not the tubing or other shapes often used in condensers. Finally, prior research has not tested the enhanced heat transfer predicted for these types of surfaces.

In a paper published early in 2012, the MIT researchers showed that droplet shape is important to enhanced heat transfer. "Now, we've gone a step further," Miljkovic says, "developing a surface that favors these kinds of droplets, while being highly scalable and easy to manufacture. Furthermore, we've actually been able to experimentally measure the heat-transfer enhancement."

The patterning is done, Miljkovic says, using a simple wet-oxidation process right on the surface that can be applied to the copper tubes and plates commonly used in commercial power plants.

The nanostructured pattern itself is made of copper oxide and actually forms on top of the copper tubing. The process produces a surface that resembles a bed of tiny, pointed leaves sticking up from the surface; these nanoscale points minimize contact between the droplets and the surface, making release easier.

Not only can the nanostructured patterns be made and applied under room-temperature conditions, but the growth process naturally stops itself. "It's a self-limiting reaction," Miljkovic says, "whether you put it in [the treatment solution] for two minutes or two hours."

After the leaflike pattern is created, a hydrophobic coating is applied when a vapor solution bonds itself to the patterned surface without significantly altering its shape. The team's experiments showed that the efficiency of heat transfer using these treated surfaces could be increased by 30 percent, compared to today's best hydrophobic condensing surfaces.

That means, Miljkovic says, that the process lends itself to retrofitting thousands of power plants already in operation around the world. The technology could also be useful for other processes where heat transfer is important, such as in dehumidifiers and for heating and cooling systems for buildings, the authors say.

Challenges for this approach remain, Miljkovic says: If too many droplets form, they can "flood" the surface, reducing its heat-transfer ability. "We are working on delaying this surface flooding and creating more robust solutions that can work well [under] all operating conditions," he says.

The research team also included postdocs Ryan Enright and Youngsuk Nam and undergraduates Ken Lopez, Nicholas Dou and Jean Sack, all of MIT's mechanical engineering department.

###

The work was supported by MIT's Solid-State Solar Thermal Energy Conversion Center, the U.S. Department of Energy, the National Science Foundation and the Irish Research Council for Science, Engineering and Technology.

Written by David Chandler, MIT News Office


[ Back to EurekAlert! ] [ | E-mail | Share Share ]

?


AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert! system.


Source: http://www.eurekalert.org/pub_releases/2013-01/miot-ruj010313.php

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