Chinese Ambassador Makes Courtesy Call on the Prime Minister

first_img Related Items: Facebook Twitter Google+LinkedInPinterestWhatsApp Facebook Twitter Google+LinkedInPinterestWhatsAppBahamas, August 15, 2017 – Nassau – Ambassador of the People’s Republic of China to the Commonwealth of The Bahamas His Excellency Huang Qinguo made a courtesy call on Prime Minister, Dr. the Hon. Hubert Minnis on Monday, August 14, 2017 at the Office of the Prime Minister.The Bahamas and China recently recognized their 20th anniversary of diplomatic relations at a Reception on Friday evening at the British Colonial Hilton.    Photos show a gift presentation during the courtesy call, and the Prime Minister with the Ambassador in a group including, from left: Chinese Embassy officials, Ambassador Huang Qinguo (third left), Prime Minister Minnis, Office of the Prime Minister Senior Policy Adviser Joshua Sears, and Office of the Prime Minister Permanent Secretary Jack Thompson.(Photos/OPM Media Services)last_img read more

Lukaku opens up on the positive vibes in Uniteds squad

first_imgRomelu Lukaku revealed that Manchester United players are enjoying the happy atmosphere in training since the exit of Jose Mourinho.The Belgian forward may not be having more game time under Ole Gunnar Solskjaer, but he admitted the positive vibes in the squad has been a key factor to their success.“It’s different, a lot more positive,” he told Canal+.“People are smiling. At the moment everything is going well, and we have to continue like this. We’re enjoying it.”Lukaku further claimed everyone is getting back to their best again after a difficult start to the campaign, with the improved form of Pogba and Rashford a testimony to the assertion.“We tell him at training, Paul is happy, and then he laughs,” Lukaku disclosed via FourFourTwo.Tammy Abraham, ChelseaChelsea hat-trick hero Tammy Abraham hopes for more Andrew Smyth – September 14, 2019 Tammy Abraham hopes this season will be his big breakthrough at Chelsea after firing his first hat-trick for the club in Saturday’s 5-2 win at Wolves.“At the moment, everyone is playing at their level. That’s what’s good. Paul, Marcus (Rashford), even myself when I play, I try to bring something to the team, Anthony (Martial). The competitive mindset is returning in every player.“You see it at training when we do mini games, 6 vs 6, 8 vs 8, you can see the players are wanting to prove themselves to the manager because they want to take their chance, but the most important remains the team. That’s what’s going to help us to return where we belong.”Up next for Manchester United is a tricky tie against relegation-threatened Fulham on Saturday.Lukaku: “This competitive spirit is coming back out of each player, it has already started in training when we play small-sided matches, 6 vs 6, 8 vs 8, you can see it the players want to prove themselves to the manager.” #MUFC #GGMU pic.twitter.com/74u1IXB7Jp— UnitedReds.com (@UnitedRedscom) February 4, 2019last_img read more

Easterseals helps veterans who are transitioning out of the military

first_imgEasterseals helps veterans who are transitioning out of the military Posted: August 12, 2019 August 12, 2019 00:00 00:00 spaceplay / pause qunload | stop ffullscreenshift + ←→slower / faster ↑↓volume mmute ←→seek  . seek to previous 12… 6 seek to 10%, 20% … 60% XColor SettingsAaAaAaAaTextBackgroundOpacity SettingsTextOpaqueSemi-TransparentBackgroundSemi-TransparentOpaqueTransparentFont SettingsSize||TypeSerif MonospaceSerifSans Serif MonospaceSans SerifCasualCursiveSmallCapsResetSave SettingsSAN DIEGO (KUSI) – The Easterseals Bob Hope Veterans Support Program provides employment services, as well as referrals to other resources, to help military personnel and veterans who are transitioning out of the military into a civilian job or starting their own small business.Director of Operations for the program John Funk and recently retired Chief Petty Officer Michelle Warnecke joined us at KUSI to discuss how Easterseals is helping men and women in the armed forces. KUSI Newsroom Categories: Local San Diego News FacebookTwitter KUSI Newsroom, last_img read more

The Wilmington Insider For July 17 2018

first_imgWILMINGTON, MA — Below is a round-up of what’s going on in Wilmington on Tuesday, July 17, 2018:Happening Today:Weather: Showers and thunderstorms likely, mainly after 3pm. Mostly cloudy, with a high near 87. Southwest wind 8 to 11 mph, with gusts as high as 21 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.At Town Hall: The Wilmington Board of Health meets at 5:30pm in Town Hall’s Room 9. Read the agenda HERE.In The Community: Wilmington’s Academy of Traditional Karate (155 West Street, Suite 5) is holding a free Self Defense Class for community members from 6:45pm to 7:45pm. The seminar will offer practical self-defense solutions, taught by instructors with years of martial arts and law enforcement experience. No martial arts experience required. Call 978-658-2077 or email TeamElite@Traditional-Karate.com for additional information.In The Community: Middlesex District Attorney Marian Ryan and The Burlington Mall will host a summer safety event from 11am to 2pm in the Mall’s parking lot, behind Primark, next to Mall Road. Attendees will be able to visit with first responders, get summer safety resources and enter a free raffle to win a toy helicopter. Car seat inspections and installations will be provided by the Burlington Police Department. Visitors can bring a new car seat to be installed or have a previously installed car seat inspected for safety. Children will have the opportunity to explore emergency vehicles from the Burlington Police Department, Burlington Fire Department, and Armstrong Ambulance. Families can stop by the Summer Safety Resource Booth with information on how to stay safe during the summer months, plus summer safety-themed games and activities.In The Community: Wilmington Friendship (Masonic) Lodge (32 Church Street) is hosting a Red Cross Blood Drive from 1pm to 7pm. Drop-ins welcome.In The Community: The Tewksbury/Wilmington Elks holds bingo — open to the public — every Tuesday. Doors open at 5pm. Pizza, hot dog and pastries are sold. Free coffee.In The Community: Angels In Motion meets every Tuesday, from 9:30am to 2:30pm, at the Wilmington Knights of Columbus Hall (112 Middlesex Avenue).  The club provides a great opportunity for seniors to meet new friends or reacquaint with old ones. A luncheon is served as noon.  Free. Handicapped accessible.In The Community: The Town Beach is open today.  Lifeguards are on duty from 10am to 8pm. Admission is FREE for residents. Proof of residency is required. Learn more HERE.At The Library: Preschool Storytime: Sounds of Nature at 10am. LEGO Building at 3pm. Teen Trivia: Musicals at 6:30pm. [Learn more and register HERE.]At The Senior Center: Walking Group at Yentile at 8am. Computer Class at 9am. Aerobics at 10:30am. Mah Jong at 1pm. Summer Brain Camp at 1pm. [Learn more HERE.](NOTE: What did I miss? Let me know by commenting below, commenting on the Facebook page, or emailing wilmingtonapple@gmail.com. I may be able to update this post.)Like Wilmington Apple on Facebook. Follow Wilmington Apple on Twitter. Follow Wilmington Apple on Instagram. Subscribe to Wilmington Apple’s daily email newsletter HERE. Got a comment, question, photo, press release, or news tip? Email wilmingtonapple@gmail.com.Share this:TwitterFacebookLike this:Like Loading… RelatedThe Wilmington Insider For June 25, 2018In “5 Things To Do Today”The Wilmington Insider For September 11, 2018In “5 Things To Do Today”The Wilmington Insider For October 17, 2018In “5 Things To Do Today”last_img read more

CHAMBER CORNER Learn About Wilmingtons Partners In Rehab Physical Therapy

first_imgWILMINGTON, MA — The Wilmington-Tewksbury Chamber of Commerce profiles a different member in the local media each week.  In this week’s “Chamber Corner,” the Chamber is spotlighting Partners In Rehab Physical Therapy, located on Concord Street in Wilmington.Like Wilmington Apple on Facebook. Follow Wilmington Apple on Twitter. Follow Wilmington Apple on Instagram. Subscribe to Wilmington Apple’s daily email newsletter HERE. Got a comment, question, photo, press release, or news tip? Email wilmingtonapple@gmail.com.Share this:TwitterFacebookLike this:Like Loading… RelatedPHOTOS: Wilmington-Tewksbury Chamber Of Commerce Welcomes Partners In Rehab PT To WilmingtonIn “Business”CHAMBER CORNER: Meet Assunta Perez Of DaMore LawIn “Business”CHAMBER CORNER: Learn About Align Credit Union’s Student AccountsIn “Business”last_img read more

State Rep Dave Robertson Discusses Education Senior Care Combatting Opioid Dependency In

first_imgBOSTON, MA — Below is a press release from State Representative Dave Robertson’s office:Ending late Thursday evening, Representative David Robertson and the House of Representatives passed the House version of the 2020 budget in a critical step setting out the course of state investments over the next fiscal year. Focusing especially on education, senior care, environmental programs and the opioid epidemic, the $42 billion dollar budget also boosted local aid in order to reduce local property taxes and provide municipalities with revenue needed for local services and operations.“I am proud of this budget. The House, under Speaker Robert DeLeo and Chairman Michelwitz, worked with other Chairmen and Representatives to create a community-facing budget.” Said Representative Robertson from the floor. “We sought to help towns like Tewksbury and Wilmington by increasing educational aid, unrestricted general aid the towns may use at their discretion, and other support. This will help strong community services while maintaining livability within our homes.”A highlight of the education portion of the budget was the increase of state aide to school districts by $30 per student, which reflects a recommendation by the Foundation Budget Review Commission. Convened in 2015, the commission studied state aid to schools and advised recommendations to support educational services as their mission adapts and changes. The total increase, topping out at $218 million dollars, is given to each town to ease the demand on property taxes and support schools locally. In addition to general aid the Special Education Circuit Breaker, which reimburses schools for extra-support for students requiring additional assistance received a nine million dollar increase.In the Health and Human Services portion of the House’s budget, our senior populations should be happy to know that many programs that they rely on benefitted greatly. With nursing home costs rising, and their necessary services needed by more and more of Massachusetts’ aging population, the FY2020 budget sought to address this growing problem through an increase in supplemental funding for nursing homes across the Commonwealth and an emergency task force aimed at helping to bring stability to the industry to mitigate or end the ever-increasing costs of the industry. In addition to these nursing home changes, funding increases to municipal Councils on Aging across the state should be able to reach out to and positively affect more seniors in their communities.In addition to addressing funding changes in education, and senior care programs, the FY2020 budget continues the Legislature’s hard push to fighting opioid addiction. This public health crisis has touched nearly every household across the Commonwealth through one form or another. Last year Massachusetts ranked among the top ten states with drug overdose deaths involving opioids, with over 2,000 people succumbing to an opioid overdose in Massachusetts, and with a disproportionate (population wise) percent of those deaths occurring in Middlesex County. In addition to funding to substance abuse and recovery services to help those in need, the House budget gives all EMS and ambulance companies access to bulk-purchase naloxone, making it more available for use in the field, especially in communities whose emergency services have had difficulties being fully funded.“Families throughout the Commonwealth, including Tewksbury and Wilmington have been hit hard by the opioid epidemic, and I hope the funding in our state budget will provide us with a framework to continue to build an appropriate response to this overwhelming issue, and to stop the tragedies and help save lives,” said Robertson. “But, this critical funding in the House is just that, a starting point for us as a community to continue to build from in our fight.”Local earmarks for Tewksbury and Wilmington included direct subsidization for lot improvements at Livingston Street fields and a new ambulance in Tewksbury, as well as renovations to be made to the Buzzell Senior Center in Wilmington. The budget will next be debated by the Senate before consolidation and gubernatorial review in the coming weeks.Like Wilmington Apple on Facebook. Follow Wilmington Apple on Twitter. Follow Wilmington Apple on Instagram. Subscribe to Wilmington Apple’s daily email newsletter HERE. Got a comment, question, photo, press release, or news tip? Email wilmingtonapple@gmail.com.Share this:TwitterFacebookLike this:Like Loading… RelatedTarr, Robertson & Gordon Secure $30,000 In State Funding For Wilmington Senior Center ImprovementsIn “Government”ALL POLITICS ARE LOCAL: Robertson & Gordon Endorse Ed Markey With Possible Kennedy Showdown LoomingIn “Government”State Rep. Dave Robertson & His Colleagues Help Tewksbury Take Official Possession Of Livingston StreetIn “Government”last_img read more

Diabetes cases reach 422 million as poorer countries see steep rises

first_imgThere are four times more people living with diabetes today than there was in 1980. On the eve of World Health Day, which focuses this year on how to beat diabetes, the World Health Organization (WHO) says the number of patients with the condition has reached an all-time high of 422 million compared to 108 million in 1980.In its Global Report On Diabetes, the WHO also emphasises that priority should be put on prevention and research for treatments. Diabetes directly caused 1.5 million deaths in 2012, and led to 2.2 million further related deaths mainly due to a raised cardiovascular risk. However, the reports authors say many of these deaths could have been avoided by promoting healthier habits and improving care and treatments of the disease. Promoting healthy lifestylesThe report points out that the diabetes epidemic is fuelled by unhealthy lifestyles, and by rising obesity. It is indeed a risk factor for type 2 diabetes. In 2014, over a third of adults worldwide were overweight and more than 1 in 10 were obese.The WHO advocates population-based prevention strategies. For example, smoking is a risk factor for diabetes and the report highlights that it can be reduced by a combination of legislative, regulatory, fiscal and educational measures. These include graphic warnings on cigarette packs, bans on advertising and increased tobacco taxes. More importantly, the organisation says that healthy eating and exercising should be even more promoted than it already is. An adequate diet includes replacing saturated fatty acids with polyunsaturated fatty acids and eating enough dietary fibre (present in lentils, beans, peas and other fruits and vegetables). The WHO has published a complete set of guidelines that can be checked on its website. If we are to make any headway in halting the rise in diabetes, we need to rethink our daily lives: to eat healthily, be physically active and avoid excessive weight gain, Dr Margaret Chan, WHO director-general, said in a statement.Increasing access to different medicinesThe Sustainable Development Goals, signed in 2015, introduced the so-called target 3.4, which strives to reduce premature deaths from non-communicable diseases (NCDs) by 30% by 2030. In order for this to be achieved, more needs to be done to increase availability and affordability of life-saving medicines. In the case of diabetes, access to insulin is crucial, but there are huge inequalities worldwide with regards to accessing it.Around 100 years after the insulin hormone was discovered, the Global Report On Diabetes shows that essential diabetes medicines and technologies, including insulin, needed for treatment are generally available in only one in three of the worlds poorest countries, points out Dr Etienne Krug, director of WHOs Department For The Management of NCDs, Disability, Violence and Injury Prevention.To beat diabetes and make the World Health Days slogan become a reality, countries still have a long way to go.last_img read more

3 dead several missing IMD issues red alert in Kerala following heavy

first_imgKannur floodTwitterThe Indian Meteorological Department (IMD) has issued a red alert in Kerala due to the heavy downpour that has created a flood-like situation in the several districts.The red alert has been issued for Kasargod district and orange alert has been issued for Kannur, Kozhikode, Idukki, Malappuram and Wayanad districts. IMD has also issued a yellow alert for Thiruvananthapuram, Kottayam, Ernakulam, Pathanamthitta, Kollam, Alappuzha, Thrissur and Palakkad.The heavy rains have lashed several parts of the state and many different parts of Kannur is still flooded. Three people have been reported to be dead from Kannur, Pathanamthitta and Kollam districts and several people are also missing from various districts due to the rain. Many rescue camps have been opened at the areas affected by the rain.Several fishermen have also gone missing after they set out from Vizhinjam and Shaktikulnagara in Kollam and the coastal police are trying to locate them. Helicopters have also been deployed to trace the missing fishermen. The locals have protested against the police claiming that no actions were taken by the authorities over the missing fishermen.In the wake of heavy downpour in the catchment area, the government has opened one shutter of Kallarkutty Dam in Idukki district as the water level has reached 2307.12 ft due to the south-west monsoon which continues to intensify. The IMD has predicted over 20 cm of rainfall between July 19-22 in the state. Kannur floodTwitterTwo shutters of the Malankara dam was opened on Friday and more shutters are also expected to open due to the high intensity of the rain. Other dams including Aruvikara, Pambla (lower Periyar), Boodhathankettu have also opened their shutters.last_img read more

US urges Myanmar to help implement Annan Commission recommendations

first_imgUS State Department spokesperson Heather Nauert. Photo: ReutersThe USA has urged the Myanmar government to fulfil its commitment to work with UNHCR and UNDP to implement the recommendations of the Kofi Annan-led Advisory Commission on Rakhine State.”We welcome the signing of a Memorandum of Understanding (MOU) by UNHCR, UNDP, and the Myanmar government to support the creation of conditions conducive to the voluntary, safe, dignified, and sustainable return of Rohingya refugees to Burma, whether to their places of origin or of their choosing,” US Department of State spokesperson Heather Nauert said on Thursday.Nauert said this is a positive step and they see this MoU as a confidence-building measure that, if effectively implemented, could allow much-needed humanitarian assistance to reach all the affected communities and assist Myanmar in creating the necessary conditions for voluntary return and to support recovery and resilience-based development for the benefit of all communities living in Rakhine State.last_img read more

Murder accused dies in gunfight 5 hours after killing woman

first_imgGunfight IllustrationA murder accused was killed in what police called a gunfight with them in Bakalia area of Chattogram early Sunday, just five hours after he allegedly killed a woman.The gunfight took place in Bolirhat area of Bakalia around 3:15am, said Shah Md Abdur Rouf, additional deputy commissioner (south) of Chattogram Metropolitan Police.Deceased Shah Alam, 32, was involved in the murder of Bubli Akhter, 27, in Bolirhat area, police claimed.The law enforcement said Bubli, mother of two daughters, came to her father’s home in Bolirhat area two days before the incident. Shah Alam and several other young men attacked them around 10:00pm Saturday due to previous enmity with Hasan, a local youth and friend of Bubli’s younger brother Rubel.They pointed firearms at Rubel and asked him Hasan’s whereabouts. When Rubel said he did not know anything about Hasan, they tried to shoot him. But Bubli intercepted them and a bullet hit her on the head, which killed her on the spot, police added.Abdur Rouf told Prothom Alo, “A case was filed in connection with the murder on that night. CCTV footages of a nearby house showed Shah Alam coming out of the house with two pistols in two hands. He fled the scene while shooting. All of the other youths were carrying arms.”“Acting on a tip-off, police conducted a drive in Bolirhat area to arrest Shah Alam. Sensing presence of the law enforcement, his cohorts opened fire on police, forcing them to retaliate. At one stage police recovered a body. Papers in his pocket confirmed his identity,” he added.Police recovered two pistols from the scene and sent the body to Chittagong Medical College Hospital morgue.Two more incidents of killing took place in Chattogram on Friday night.According to the human rights organisation, Ain o Salish Kendra (ASK), at least 421 people were killed in alleged gunfights, crossfire or shootouts with the law enforcement agencies in 2018.In January and February of 2019, the number of such killings was at least 50, the rights body said on its website.last_img read more

Pressley Officially Massachusetts 1st Black Congresswoman

first_imgBy WILLIAM J. KOLE, Associated PressBOSTON (AP) — Ayanna Pressley didn’t campaign to make history, but she did on Tuesday, officially becoming Massachusetts’ first Black woman elected to the U.S. House of Representatives.The Democrat sailed through the general election unopposed, two months after unseating 10-term Rep. Michael Capuano in a national political stunner in the state primary.In this Oct. 1, 2018 file photo, Boston City Councilor Ayanna Pressley speaks at a rally at City Hall in Boston. On Nov. 6, Pressley became Massachusetts’ first black woman elected to the U.S. House of Representatives. (AP Photo/Mary Schwalm, File)“Activists and agitators have brought us to this very moment,” Pressley told cheering supporters Tuesday night. “None of us ran to make history. We ran to make change … and change is on the way.”“Can a congresswoman wear her hair in braids? Rock a black leather jacket?” she added — and the crowd roared.With no Republican in the race in the heavily Democratic district, her September upset victory had all but assured Pressley the keys to the office, with only the remote possibility of a write-in campaign to potentially stop her. That unlikely scenario behind her, she’ll now represent the 7th Congressional District — the first in Massachusetts where minorities make up a majority of the voting population.“It is hard to believe that in the 230-year history of our delegation, there’s never been a person of color,” she said on “Matter of Fact with Soledad O’Brien.”(Although that’s true of the House, Republican Sen. Edward Brooke of Massachusetts, who took office in 1967, was the first Black politician to be elected by popular vote after the 17th Amendment was ratified in 1913.)Pressley, 44, is also the first African-American to serve on the Boston City Council.Endorsed last month by former President Barack Obama, she got a big early boost from fellow congressional upstart Alexandria Ocasio-Cortez, who similarly knocked off veteran Rep. Joe Crowley of New York in June.Both rode a rising wave of pro-woman sentiment to Washington as the party embraced diversity and liberal politics as the recipe for success in the Trump era.“With her victory tonight, Ayanna Pressley has not only made history as the first Black woman ever elected to represent Massachusetts in the U.S. House of Representatives, she’s ensured that Democrats have the voice of a young, Black progressive woman helping lead the fight for inclusive populist reforms,” the political action committee Democracy for America said Tuesday night in a statement.In the run-up to the midterms, Pressley held off on saying where she stands on Nancy Pelosi, the Democrats’ embattled House leader.From the outset, Pressley made clear that she meant serious business, telling voters before she sent Capuano packing that she viewed the race as “a fight for the soul of our party and the future of our democracy.”The district includes a wide swath of Boston and about half of Cambridge, as well as portions of neighboring Chelsea, Everett, Randolph, Somerville and Milton. It includes the neighborhood of Roxbury, the traditional center of Boston’s Black community.Ideologically, Capuano was much like Pressley: liberal, a self-described progressive. But the White, middle-aged incumbent didn’t look like many voters in his district, even though Pressley herself had bristled at the notion that race was a defining issue in the contest.She flashed that defiance during a debate, saying: “I happen to be Black and a woman and unapologetically proud to be both, but that is not the totality of my identity.”But Pressley also made clear the importance of diversity in the nation’s halls of power.“I do think that our democracy is strengthened by an engagement of new and different voices,” she told college newspaper editors in Boston in October.___For AP’s complete coverage of the U.S. midterm elections: http://apne.ws/APPoliticslast_img read more

Electronics like it cold and 30 K cryocooler delivers

first_img Copyright 2013 Phys.org All rights reserved. This material may not be published, broadcast, rewritten or redistributed in whole or part without the express written permission of Phys.org. Journal information: Journal of Micromechanics and Microengineering (Phys.org)—For many electronic devices, colder is better. At low temperatures, electronic devices such as sensors and detectors operate with a higher efficiency and better overall performance than they do at room temperature. And superconducting devices, known for their zero electrical resistance, require extremely cold temperatures to operate. But in order to make cryogenic electronics more widespread, micro-sized cryogenic coolers need to become cheaper and more reliable. Addressing this challenge, scientists have designed and fabricated a micro-sized cryocooler that cools devices down to 30 K (-243 °C, -406 °F) in about an hour, and has a simple design that lends itself to high-yield fabrication. The researchers, Haishan Cao from the University of Twente in Enschede, The Netherlands, and coauthors from Kryoz Technologies and Micronit Microfluidics, both in Enschede, as well as from the University of Twente, have published a paper on the new micro-sized cryogenic cooler in a recent issue of the Journal of Micromechanics and Microengineering.The new cryocooler is a micro-sized version of a Joule-Thomson (JT) cryocooler, which cools by causing a high-pressure gas to expand as it flows from a high-pressure region to a low-pressure region. As James Joule and William Thomson discovered in 1852, a gas that expands in this way under certain conditions will cool down, a finding now known as the Joule-Thomson effect. In the new study, the micro-sized cryocooler uses two stages to cool a device. The first stage involves a single-stage cryocooler device that other researchers at the University of Twente previously designed, which cools down to 100 K (-173 °C, -180 °F) using nitrogen as the gas. In the second stage, which cools down to 30 K, the researchers used hydrogen as the gas. The reason for using two different gases is that the Joule-Thomson effect only works (i.e., produces a cooling effect) if the expanding gas is already cooled below a certain temperature called its inversion temperature. This critical temperature is different for different gases. If the gas is above this temperature, then expansion will cause the gas to warm up rather than cool down. Nitrogen has a higher inversion temperature than hydrogen, which is why the researchers used nitrogen in the pre-cooling stage, and then cooled the hydrogen through heat-exchange with the nitrogen until the hydrogen surpassed its inversion temperature of 205 K (-68 °C, -91 °F) so that it could be cooled by the second Joule-Thomson process.”30 K is sufficiently cold to cool most electronic devices such as infrared detectors, low-noise amplifiers and high-temperature superconducting devices,” Cao told Phys.org. “To cool superconducting devices based on Nb3Sn or NbTi, an even lower temperature is required. To reach even lower temperature using the Joule-Thomson effect, a helium stage is needed, in which the hydrogen stage works as a precooler for the helium stage.” (Bottom left) Photograph of the microcooler mounted into a vacuum flange and surrounded by a PCB, with gas connections. (Top right) The microcooler shown next to a euro coin for size comparison. Credit: H. S. Cao, et al. ©2013 IOP Publishing Ltd More information: H. S. Cao, et al. “Micromachined cryogenic cooler for cooling electronic devices down to 30 K.” J. Micromech. Microeng. 23 (2013) 025014 (6pp). DOI: 10.1088/0960-1317/23/2/025014 To demonstrate the feasibility of the new two-stage cryocooler, the researchers attached a YBCO film to the device to be cooled to its superconducting state. Starting from room temperature, the scientists showed that the nitrogen stage could cool the film to 94 K in about 20 minutes, and the hydrogen stage could cool the film to 30 K in an additional 40 minutes. During this cool-down process, the film reached its superconducting state, demonstrating the possibility for integrating the cryocooler with electronic devices.One of the biggest advantages of the micro-sized cryocooler is that it has the potential be fabricated at low cost on a large scale. The cooler consists of just three glass wafers ranging in thickness from 145 to 400 μm, which are etched, stacked and bonded together. A stack of wafers can also be cut into multiple microcoolers using a dicing and powder blasting process. Another benefit is that the cryocooler operates at modest pressures, ranging from 0.1 MPa (room pressure) for the low-pressure region and 8.0-8.5 MPa for the high-pressure regions. When the pressure is higher, fabrication becomes more complex, in particular the bonding process. “A 30 K micro cryocooler is the coldest micro cryocooler that has been published in academic journals,” Cao said. “W. Little previously presented a seven-wafer stack two-stage JT micro cryocooler operating at 14 MPa with a cold-end temperature of about 30 K. Our two-stage 30 K JT micro cryocooler is operated with modest pressures and realized in a stack of only three wafers. Compared to three-wafer stack micro cryocoolers, seven-wafer stack micro cryocoolers are much more difficult to fabricate with acceptable yields. Furthermore, high gas pressures add more stringent requirements to the bonding process and severely add complexity to the development of a compressor for closed-cycle operation of the cryocooler.”The researchers hope that the relatively simple device requirements and the ability to cool to cryogenic temperatures (defined as temperatures below about 120 K [-153 °C, -244 °F]) will expedite cryogenic electronics applications. Such electronic and superconducting sensors and detectors could be especially useful in medical and space applications.”In medicine, cryogenic electronic devices can be used in some diagnostic techniques, for example, tracing the spread of breast cancer cells,” Cao said. “To determine whether the cancer has spread, the traditional way is to introduce radioactive particles into the body. But the radioactivity represents a health risk for both patient and medical personnel. Another method is using magnetic particles. However, existing detectors are not sensitive enough to measure the signal of the particles. The signal-to-noise ratio of the detectors could be greatly improved by cooling. Another application could be micro cryosurgery with miniaturized cold tips (for removing cancerous tissue).”Applications of cryogenic electronic devices in space include scientific instrumentation, telecommunications and earth observation, and meteorology satellite. Many science missions in space use optical detectors that operate at cryogenic temperatures to increase their sensitivity. Radio-frequency devices (filters, delay lines, resonators and antennas) based on high-temperature superconductors have high potential to improve the energy efficiency of telecommunications systems or to reduce their size and weight. Earth observation missions require cryogenics because of the utilization of medium infrared detectors (typically operating around or just below 100 K) to image the earth surface. “For these applications, the cooler should be small, low cost, low interference and have a very long lifetime. Joule-Thomson micro cryocoolers are excellent for this, because these have no cold moving parts and therefore can be scaled down to match the size and the power consumption of these devices.”In the future, the researchers plan to experiment with using gas mixtures in order to achieve lower temperatures at lower pressures.”One of the future goals is to combine the micro cryocooler with a sorption compressor to realize a total micro system,” Cao said. “Other future research topics in this area include three-stage microcryocoolers, micro cryocoolers using double expansion cycles and the use of a gas mixture as the working fluid. To reach temperatures near the boiling point of helium gas, it is necessary to use three stages. A nitrogen stage is used to precool a hydrogen stage, which works as a precool for a helium stage. Using a double expansion cycle, a Joule-Thomson cooler can achieve a lower temperature due to the reduction of the pressure drop in the low-pressure line. Compared to pure gas, mixed gases provide equivalent cooling power with significantly lower pressure ratio.” Explore further Faster and more sensitive electronics thanks to compact cooling Citation: Electronics like it cold, and 30 K cryocooler delivers (2013, January 18) retrieved 18 August 2019 from https://phys.org/news/2013-01-electronics-cold-cryocooler.html This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only.last_img read more