first_imgFacebook0TwitterEmailPrintFriendly分享Governor Mike Dunleavy announced on Tuesday the future deployment of approximately ten soldiers from the Alaska Army National Guard’s 1st Battalion, 207th Aviation Regiment to the U.S. southern border. The deployment, which will begin April 1, 2019 in support of aerial patrol operations on the Arizona/Mexico border, comes following a request for National Guard volunteers through the National Guard Bureau, according to a release from the Governor’s office.  This is the first deployment of the Alaska National Guard to support the current border security mission. Alaska’s support for this request is not expected to impact any scheduled local training, deployments or domestic operations commitments, including fire suppression operations. This deployment to the U.S. Southern border will be funded by the federal government. Governor Dunleavy: “Alaska stands ready in support of the President’s mission to secure the southern border. While this emergency may be thousands of miles away, we must be vigilant in our shared responsibility to address this crisis. I thank the numerous guardsman, and their families, for answering the call of duty and volunteering to serve in these important support roles.”last_img read more

first_imgAlaskans have one month left to register with FEMA for disaster assistance. The deadline is midnight on Friday, May 31. Residents can apply for federal disaster assistance the following ways:Visit a disaster recovery center. Facebook0TwitterEmailPrintFriendly分享More than $71.5 million in federal assistance has been approved to help residents in the Municipality of Anchorage, Matanuska-Susitna Borough and Kenai Peninsula Borough recover from the November 30 earthquake. Call the state hotline at 855-445-7131 for more information.A snapshot of the disaster recovery effort as of April 30 follows:More than $11.6 million in FEMA grants has been approved to help homeowners and renters.More than $59.9 million has been approved by SBA in federal disaster loans for 1,416 Alaska businesses and residents to help pay for uninsured and underinsured damage.7,874 (98 percent) home inspections have been completed.center_img Online at DisasterAssistance.govCall 800-621-3362 (FEMA), voice/VP/711. Multilingual operators are available. TTY users may call 800-462-7585. Lines are open daily from 6 a.m. to 9 p.m. local time. Residents who think they may have damage, but it is not yet apparent, should register as soon as possible. Alaskans who registered with the state before February 28, need to register with FEMA to be reconsidered for the State Individual Assistance program.last_img read more

first_img This year, the trend continues with the loss in sales in smaller retailers and the declining sales of smaller titles. This has a huge influence on the overall sales numbers; there were more than 8,000 fewer retail accounts being serviced in the first quarter of this year in contrast to last. The top ten chains in Q1 2015 represented 53.3 percent of total sales, compared to a collective market share of 51.8 percent in 2014. This is a trend that will likely continue as smaller retail stores exit the business. Although there will likely be no major turnaround in the foreseeable future, MagNet notes that decisions being made by publishers to reduce their allocations, partially driven by wholesaler demands for subsidies, are having a substantial impact on the steady sales decline. That comes in addition to the rise in social media and mobile technology in influencing how consumers view and absorb content. The Top 100 chains’ combined sales beat the overall business trends, which again indicates that the industry is losing smaller retailers. But the publishers who performed well in the first quarter all followed the same formula: more releases. Many of these publishers also tacked on higher cover prices, like Penny Press, which had 13 percent more releases, and an average cover price increase of about 23 percent.  Time Inc.’s numbers benefitted from more book-a-zine releases under their THEI brand, as well as the higher cover price on People. Harris Publications also increased their number of releases and focused more on book-a-zine products. Overall, the average cover price of a unit sold in the first quarter increased by 36 cents (more than 7 percent). Two factors contributed to this jump: 1) higher cover prices on many of the weekly titles, and 2) the continued publisher focus on book-a-zines with cover prices startingat $9.99. These factors helped drive the average cover price on a unit sold to an all-time high, which is one of the few good signs for the industry—consumers are willing to pay higher prices for quality printed magazines. center_img Although it’s easy to fall back on saying “social media is to blame,” publishers also need to reassess their releases—how often to distribute and how much are they going to charge according to MagNet’s 2015 Q1 Newsstand Sales Results. Magazine unit and dollar sales improved slightly in the first quarter to declines of 14.2 percent and 8.3 percent, respectively, compared to drops of 15.6 percent and 9 percent in the prior quarter. The average dollar sales decline of the Top 25 titles was mitigated this quarter by the higher cover prices on the weekly titles. Even though the newsstand sales environment is bleak, decisions being made by publishers have a major impact. So keep producing quality content but perhaps release it in a higher quality product and quit reducing your allocations, as MagNet suggests doing the opposite has proven to only be beneficial.last_img read more

first_img All the cool new gadgets at CES 2019 Angela Lang/CNET Smart mirrors are popping up everywhere at CES 2019 and Capstone Connected Home is jumping in the game with a Google Assistant-enabled model. The touchscreen mirror allows you to download apps from the Google Play store, stream YouTube and ask Google Assistant anything you would in a standard smart speaker. You can also compose emails and messages by typing directly on the mirror. Voice control in the mirror can recognize six different voices and log users in and out of Google accounts. The company says this method still keeps user data private. The mirror does require the Capstone Connected Control Hub. The hub is also a touchscreen device, like a tablet, that acts as the command center for the mirror. You can hang the Capstone Smart Mirror or stand it up on a counter. The mirror will be available in multiple sizes, beginning with a 19-inch by 22-inch model in early 2019. Pricing information is not yet available.  Google Assistant CES Products Google CES 2019 0 Share your voice Post a comment Tags 85 Photos CES 2019: See all of CNET’s coverage of the year’s biggest tech show. CES schedule: It’s six days of jam-packed events. Here’s what to expect. Smart Homelast_img read more

first_imgMap of FaridpurDetectives in a drive arrested Bhanga upazila unit president of Bangladesh Chhatra League along with a pistol and yaba tablets from Bhanga Bazar of Faridpur on Monday night.Bangladesh Chhatra League is the student wing of ruling Awami League.The arrestee is Lutfar Rahman Mollah, son of Gias Mauri of Kapuria Sadardi village in the upazila, said Rakibul Islam, officer-in-charge of Detective Branch of police.Acting on a tip-off, detectives conducted a drive in the area around 10:00pm and arrested Lutfar.Later, they recovered a foreign pistol, two rounds bullet and 200 pieces of yaba tablets from inside his car.Lutfar was accused in several drug related cases and was arrested earlier by Rapid Action Battalion, said Kazi Shahidur Rahman, officer-in-charge of Bhanga police station.last_img read more

first_imgUS first lady Melania Trump arrives at the McAllen airport as she prepares to depart after a visit to the US-Mexico border area in McAllen Texas, US on 21 June. Photo: AFPMelania Trump made a surprise trip to the US-Mexican border on Thursday as her husband’s administration seeks to quell a firestorm over migrant family separations, while Republican lawmakers were forced to delay a high-stakes vote on the crisis.While President Donald Trump’s administration struggled to formulate next steps, the Pentagon signalled officials were bracing for a lengthy ordeal. The military said it will prepare to house up to 20,000 unaccompanied migrant children on its bases.The first lady’s unannounced visit came a day after the president-in a stunning about-face-moved to end the practice of splitting migrant families, which had prompted outrage at home and abroad.There was, however, no immediate plan in place to reunite the more than 2,300 children already separated from their families-igniting a fresh controversy over the conditions in which the children are living.In McAllen, Texas, Melania Trump visited the Upbring New Hope Children’s Shelter, a federally-funded facility that houses about 55 children from Honduras, Guatemala and El Salvador, ages five to 17.“I’m glad I’m here and I’m looking forward to seeing the children,” Melania said at a roundtable discussion with social workers and government officials.“I would also like to ask you how I can help these children to reunite with their families as quickly as possible.”Images and recordings of wailing youngsters detained in processing centers with chain-link cage-like enclosures has ignited global outrage.The first lady herself had called for a political compromise to end the separations-the result of the administration’s “zero tolerance” policy launched in early May, under which illegal border crossers were systematically prosecuted and their children separated from them as a result.Melania spent an hour-plus at the shelter, talking directly to children who spoke to her either in English or in Spanish, through a translator.One girl said she had been at the shelter for two months. Another told Trump they were learning how to celebrate the Fourth of July.“Usually when they get here, they’re very distraught,” one official said.Melania Trump was unable to escape controversy on the trip. She boarded and exited her plane wearing a jacket which read “I really don’t care. Do U?”-a cryptic message that sent the internet ablaze.Legislative dramaThe political compromise the first lady had sought has not materialized so far.In Washington, lawmakers failed to advance either of two Republican immigration bills in the House of Representatives.A hardline proposal was defeated, as expected.But a vote on a “compromise” bill between the party’s conservative and moderate wings, which ends family separations but also includes Trump priorities like curtailing legal immigration and providing some protections to young immigrants, was pushed back to Friday, and then to next week, in a sign there was no immigration consensus within the party that controls Congress.The failure dealt an embarrassing blow to Republicans under intense pressure to take legislative steps to address the issue.The crisis was fueling a brutal partisan scrap, with Trump blaming “extremist” Democrats for refusing to help tighten border security.“Democrats want open Borders, where anyone can come into our Country, and stay,” he tweeted.The House’s top Democrat Nancy Pelosi blasted back, accusing Republicans of making a “compromise with the Devil” instead of with Democrats, and saying they were complicit in Trump’s “atrocities.”Indefinite detention?For weeks, Trump had insisted he was bound by law to split children from their parents and that only Congress could resolve the problem-before he radically shifted gears.Trump’s executive order would keep families together but in custody indefinitely while parents are prosecuted for entering the country illegally-a move that could lead to new legal battles for the administration.The Justice Department moved Thursday to modify the 1997 court ruling known as the Flores Settlement, which places a 20-day limit on how long children, alone or with their parents, can be detained.Lawmakers from both parties, as well as faith groups, families and children have recoiled at how the administration has handled the crisis.Several clergy, parents and children wearing fake Mylar blankets like those given to minors detained at the border protested in a Senate office building, while lawmakers denounced Trump’s policies on the floors of the House and Senate.A bipartisan group of American mayors including New York’s Bill de Blasio rallied outside a migrant children’s shelter near El Paso, Texas to denounce a lack of transparency, and demand family reunification.“The families are not reunified, we don’t know when they’ll be, we’re going to fight for that,” said de Blasio, who a day earlier declared himself “shocked to learn” that a single centre in Harlem had received 239 separated children without the knowledge of city authorities.Trump insisted there was a need to sustain his “zero tolerance” policy “or our country will be overrun by people, by crime,” he said.After a downturn last year, the flow of migrants from Central America and Mexico has surged since October.From March to May this year, more than 50,000 people a month were apprehended illegally crossing the border.Nearly all of the arriving families have officially requested asylum, citing the high levels of violence in their home countries.last_img read more

first_imgUS president Donald Trump delivers remarks to US troops in an unannounced visit to Al Asad Air Base, Iraq on 26 December 2018. Photo: ReutersUS president Donald Trump was reeling from sharp rebukes at home and abroad over his surprise announcement last month to immediately pull American troops out of Syria when he flew into the al Asad airbase in neighbouring Iraq the day after Christmas.Inside a canvas Quonset hut, one of the arced prefabricated structures used by the military and surrounded by concertina wire, Trump received operational briefs from US commanders suggesting a territorial victory against Islamic State was within sight, but the military needed just a bit more time, US officials said.”They were upbeat about their ability to wrap things up,” one of the officials told Reuters. “I definitely think that was a seminal meeting” in terms of influencing Trump’s thinking.Lieutenant general Paul LaCamera, the commander of the US-led coalition against Islamic State in Syria and Iraq, explained to a president who had lost patience with the war why too rapid a withdrawal could not be done without putting troops at risk, according to three officials familiar with the briefing, the contents of which have not been reported in such detail.In the chaotic aftermath of Trump’s 19 December announcement, which was one of the reasons that defence secretary Jim Mattis resigned, the 45-minute briefing appears to have helped crystallize an understanding between Trump and his top brass on the ground. Trump, in remarks to reporters, admitted that he felt better about the situation after talking to commanders in the theater instead of officials in Washington.The briefing also helped win the US military and diplomats some breathing room to plan a more deliberate exit from Syria.It was a novel experience for the president, who was making his first visit to a war zone in his nearly two years in office, fresh from a political pummeling over his decision on Syria from fellow Republicans in Congress and US allies.Nearly three weeks after the briefing, no troops have withdrawn from Syria and only some equipment has moved out.In 2015, then-president Barack Obama first ordered US special operations forces into Syria after long hesitating to deploy “boots on the ground” in the midst of the Syrian civil war. What started off as a mission involving dozens of commandos eventually turned into hundreds and then just kept growing. There are about 2,000 US forces in Syria today.Although Trump initially announced plans for a speedy pullout, he has since said it does not need to go quickly.”We are pulling back in Syria, we are going to be removing our troops, I never said we are doing it that quickly,” Trump told reporters at the White House on Jan. 6.In fact, Trump said on 19 December that American troops were coming home “now” and they had already defeated Islamic State in Syria. No experts believe Islamic State has been defeated, despite the group having lost almost all of the territory it held in 2014 and 2015 after seizing parts of Syria and Iraq and declaring a “caliphate.”The Pentagon said on Friday that the withdrawal “is not subject to an arbitrary timeline,” and would take into account conditions on the ground and talks with allies.Trump’s concession of additional time has set off an apparent scramble by the US military and Trump administration officials to accomplish as much as possible in the twilight of the Syria campaign.US officials tell Reuters that planning for a complete withdrawal from Syria is still underway, despite confusing and sometimes contradictory statements from the White House and tension with Turkey, which was meant to take over the campaign against Islamic State.Several officials said they expected a withdrawal before the end of March, but would not commit to a date, given fast-evolving policy discussions and hard-to-predict battlefield developments.Final BlowsPrivately, some US officials worry the final push will not be enough to preserve hard-won gains against Islamic State or ensure protection for US-backed Kurdish YPG allies who helped in the fight. NATO ally Turkey views Kurdish militia as terrorists, an extension of a Kurdish insurgency in Turkey.Trump himself acknowledged his concerns for the Kurds on Monday, warning Turkey of “economic devastation” if it attacks a US-allied Kurdish militia in Syria. US Secretary of State Mike Pompeo said he believed Trump was referring to sanctions.According to US estimates, Islamic State oversaw about 100,000 square kilometers (39,000 square miles) of territory, with about 8 million people under its control. The group had estimated revenues of nearly one billion dollars a year and used its de facto capital of Raqqa, Syria as a base to plot attacks in Europe.Backed up by US-led coalition airstrikes, artillery and advisers and equipment, US-supported ground forces in Iraq and Syria clawed back towns and cities from the jihadists. Iraq declared victory against the group in 2017.US military officials are reluctant to predict how quickly Islamic State militants can be vanquished from their final towns in Syria, recalling how the insurgents fought until the death in Mosul, Iraq. The group still influences about 300 square kilometers in the Middle Euphrates River Valley, according to the US-led coalition.The persistence of the group was one of the reasons that Trump’s decision stunned the Pentagon.But after the initial shock, military and civilians leaders including Mattis met at the Pentagon the week before Christmas to discuss the quickest, safest and most responsible way they could carry out the troop pullout and protect Kurdish allies.It became clear that a rapid 30-day withdrawal, as initially suggested by the White House, would not meet the criteria of a “safe and responsible” withdrawal. Before Trump’s surprise decision, Pentagon planning had suggested four months would be needed.One source played down Trump’s concerns about whether the drawdown would be done in weeks or months.”All he wants to know is that it is happening,” the source said.Significantly, Mattis’ order issued before Christmas did not include a specific timeline, although US officials said military commanders told the White House that a safe and responsible drawdown could not be done in less than 120 days. The order has not been changed since Mattis left office on Dec. 31, when his deputy Patrick Shanahan took over, officials said.In the meantime, the US-backed forces in Syria, including Kurds, are keeping up the fight – confounding analysts’ predictions that they would rapidly head north to prepare for an offensive by Turkey.In fact, since Trump’s withdrawal announcement, those forces have been fighting Islamic State with support from US-led coalition air strikes and artillery.US allies, who were caught entirely off-guard by Trump’s announcement, are still seeking clarification about the timing of America’s exit.The troop pullout from Syria dominated discussions by Pompeo during his meetings in Amman, Cairo, Abu Dhabi, Riyadh and Iraq over the past week, in which he told US allies that a withdrawal was a tactical change only.Allies also want information about any post-withdrawal role by the US military to ensure Islamic State militants do not rise from the ashes of their caliphate, US officials and diplomats said.But they appear relieved at the apparent slowdown of the pullout.”It seems that there has been a change that I think is positive,” French Foreign Minister Jean-Yves Le Drian of France said last week.last_img read more

first_img Live Results Story Links LOUISVILLE, Ky. – Five student-athletes from the University of Louisville track and field team will travel to Austin, Texas to compete in the NCAA Championships at Mike. A Myers Stadium . Representatives from 142 different schools will participate in women’s events, while 126 programs are represented on the men’s side.The championship begins Wednesday, June 5 with 21 events (10 prelims, 11 finals). The opening event, the 100-meter men’s finals kicks off at 3:30 p.m. ET.  All three days of championships will be available to live stream on ESPN, ESPNU or ESPN3. Find the full broadcast schedule below.Albert Kosgei will compete first for the Cardinals on Wednesday in the 3,000m steeplechase semifinals at 5:02 p.m. He carries a season best time of 8:38.90 set at the NCAA East Preliminary Round into the championships.Martice Moore will follow at 6:30 p.m. in the semifinals of the 400m hurdles. In his two runs at the NCAA East Preliminary Round, he set the school record both times with marks of 50.73 and 49.85.Makenli Forrest will compete in her first of two events on Thursday. She will compete in hammer throw at 4:30 p.m. Forrest’s season best throw of 63.08m/206-11 came at the Louisville Invitational in April. She finished with a throw of 62.12m/203-10 at the NCAA East Preliminary Round to punch her ticket to nationals.Gabriela Leon will compete in pole vault at 7:30 p.m. Earlier this season, she broke the school record clearing of 4.27m/14-00. She cleared 4.17m/13-8.25 in Jacksonville, Fla. advancing to her second straight nationals appearance.Ivine Chemutai will be the sole track runner for Louisville on Thursday, running the 10,000m at 9:38 p.m. Chemutai set a new personal best at the NCAA East Preliminary Round, crossing the finish line in 33:54.84.Forrest will throw in the discus at 5:05 p.m. on Saturday to wrap up the championship meet. She opened the outdoor season by setting a new personal best with a mark of 55.76m/182-11. She threw for 53.98m/177-1.0 at the NCAA East Preliminary Round to punch her second ticket of the championships. Print Friendly Versionlast_img read more

first_imgCredit: CC0 Public Domain © 2018 Phys.org NASA is taking a new look at searching for life beyond Earth Explore further Journal information: arXiv Citation: A model that computes the fraction of the ‘haystack’ that SETI programs have collectively examined (2018, September 28) retrieved 18 August 2019 from https://phys.org/news/2018-09-fraction-haystack-seti.htmlcenter_img More information: How Much SETI Has Been Done? Finding Needles in the n-Dimensional Cosmic Haystack, arXiv:1809.07252 [astro-ph.IM] arxiv.org/abs/1809.07252 While it might seem to people who are not space scientists that humans have done an awful lot of work searching for signs of life on other worlds, the truth is quite the opposite. Back in 2010, well-known space scientist Jill Tarter compared the search thus far to peering at a glass of water looking for fish while standing next to the still unexplored ocean. In their new effort, Wright, Kanodia and Lubar have created a model that they believe better frames the effort to date. Their model uses inputs such as the number of searches conducted and amount of space covered, and compares them to estimates of the size and intricacy of the galaxy and universe beyond.In their work, the researchers focus on the more traditional types of searching methods—using telescopes and other advanced equipment to study signals that arrive here on Earth from other places. This, of course, rules out the possibility of extraterrestrial life already residing here on Earth or unexplained phenomena such as UFOs.The researchers have found Tarter’s analogy to be quite close to reality, though they would bump the sample size from a glass to a swimming pool. But they also note that another famous analogy might need modification. They suggest the search for extraterrestrial life might be more akin to searching for any one of multiple needles in a proverbial haystack, rather than just one. But they also note that all we really need to find is just the one. Why haven’t we found evidence of life anywhere but Earth? A trio of astrophysicists has revisited this question by taking a closer look at the “needle in a haystack” analogy. Their analysis involved creating a model to assess the amount of work that has been done searching for extraterrestrial life, the Search for Extra-terrestrial Intelligence (SETI) project, compared to how much is required before scientists can rule out the possibility that there is none. Jason Wright, Shubham Kanodia and Emily Lubar have written a paper describing their efforts and uploaded it to the arXiv preprint server. 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

first_img , Advanced Materials 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. The work demonstrated the atomic geometry of metallic quantum contacts that could be modulated with light and the ability to reverse switch (on/off, vice versa) their conductance using plasmonic heating. While the atom-by-atom separation of electrodes were clearly observed, they could also adjust the gap size, between the electrodes at sub-angstrom resolution by controlling the intensity of light. Zhang et al. showed that the plasmon can potentially breakthrough the diffraction limit of light to realize nanofocusing, to transfer the plasmon-controlled atomic switch to realize highly integrated nanodevices; opening a new path to engineer nanoelectronic devices. Explore further While generating a nanogap was crucial to fabricate single molecule-based devices, engineering an adjustable atomic-scale gap has remained a significant challenge. Although fixed gap sizes could not be adjusted post-fabrication, the gap-size could be readily and continuously adjusted through plasmonic heating at sub-angstrom resolution, as shown by Zhang and the research team. For this, they used a commercial light-emitting diode (LED) lamp as a light source in the experiments with an AC adaptor to continuously control the intensity of light. The experimental setup did not require special optical hardware or high power laser sources. They used a commercially available gold wire with a constriction in the middle on a spring steel substrate to construct the nano contacts. Then using a ‘mechanically controllable break junction’ (MCBJ), the scientists stretched the constriction by bending the substrate, and observed it with scanning electron microscopy (SEM) images. Thereafter, the scientists reduced the cross-section of the constriction to form two separate electrodes. When they turned the light on, the conductance increased and decreased when the light was turned off; the large conductance resulting from light illumination strongly reconnected the two separated electrodes.The scientists analyzed the phenomenon at the level of atomic arrangement, upon light illumination. They showed that the nanogaps had strong absorption of light in the visible and near infrared regions due to localized surface plasmon resonances (LSPR). When the frequency of the LED light matched the oscillation frequency of the free electrons and the electromagnetic field at the tip of the electrodes, the LSPR around the gap was excited. The absorbed light then converted to thermal energy causing nanoelectrode expansion and their reconnection. The conductance reached its maximum value when the system was at thermal equilibrium. When the light was shut off, the electrons separated once more. Characterization of MCBJ devices and simulation of expansion distribution of the electrodes upon light illumination. a) System for the measurement of optical spectroscopy. b) Measured dark field scattering spectra from the gap area that employs three different samples. The gap size is ~2 nm in sample A and ~0.2 nm in sample B. The electrodes were strongly reconnected, and no nanogap is observed in sample C. Plasmonic resonances are indicated by the arrows. c) Model used in the simulation. Parts of the large metal wire close to the nanotips were considered. The gap size between two nanotips is initially set to 2 nm. The polarization of the incident light is parallel to the x-axis. d) Expansion distribution (in X component) when equilibrium temperature was established. Credit: Light: Science & Applications, doi: 10.1038/s41377-019-0144-z. , Light: Science & Applications Zhang et al. also observed how the nanogap size could be precisely modulated by light by showing that the conductance could be modified in the tunneling region, between the gap of the two electrodes, by controlling the LED light. When the light intensity was fixed, they could keep the tunneling current constant for longer. The scientists estimated the distance between the two electrodes using the Simmons equation; used to describe the relationship between the tunneling current and the tunneling gap size. They could thereby precisely control the distance between the two separated electrodes at sub-angstrom accuracy using the light intensity.To confirm that the origin of switching behavior was plasmon-induced heating in the nanoscale plasmonic systems, the scientists investigated the scattering spectrum of the MCBJ samples to reveal the frequency of plasmonic resonance. The results indicated that the conductance change related to the expansion of the electrodes due to plasmonic heating. Zhang et al. also performed finite element method simulations to estimate the expansion of the electrodes and solved the electric field distribution, temperature distribution and thermal expansion on light illumination, using the COMSOL Multiphysics program package. The simulation calculated the maximum displacement of the electrodes as approximating 0.4 nm. Zhang et al. were able to further optimize the switching frequency by optimizing the characteristic dimensions for heat transfer. In this way, the scientists experimentally proved that atomic switches could be rapidly operated via plasmonic heating. Illumination system with different frequencies. Credit: Light: Science & Applications, doi: 10.1038/s41377-019-0144-z Dependence of conductance on the incident light. a) Real-time measurement of the conductance upon the LED light illuminations in the tunneling regime. Vbias = 1 mV. b) Schematic of the gap size variation upon light illumination. The dashed lines indicate the new position of the nanoelectrodes upon LED illumination. c) The conductance of the tunneling gap dependent on the laser polarization. When a p-polarized laser (pink) is employed, the conductance is approximately two times larger than the conductance when an s-polarized laser (orange) is employed. The laser central wavelength is 640 nm with a bandwidth of 5.7 nm, and the maximum laser power density is 0.5 mW/mm2. Credit: Light: Science & Applications, doi: 10.1038/s41377-019-0144-z. , Nature Nanotechnology © 2019 Science X Network Current modulated by the light illumination. Credit: Light: Science & Applications, doi: 10.1038/s41377-019-0144-z.center_img LEFT: a) A metal wire with a notch in the middle is fixed on the substrate. The notch can be stretched until it finally breaks due to the bending of the substrate, which produces two separated electrodes. b SEM images of the notched microwire during the stretching process. Scale bar: 50 μm. c Real-time measurement of the current with the light switched on/off every 50 s–60 s. Zoomed image: conductance decreases in quantum steps at multiples of G0 (=2e2/h) as the light intensity decreases. d Schematic of the atomic arrangement, which corresponds to four conductance states upon light illumination. State 1: the two electrodes are separated by a few angstroms (G ≪ 1 G0). State 2: the two electrodes are reconnected upon light illumination (G ~ 80 G0). State 3: the two electrodes are stretched, and a gold atom chain is formed before the nanocontact breaks when the light intensity is reduced (G ~ 1 G0). State 4: the two electrodes are separated again due to the heat dissipation as the light is completely turned off (G ≪ 1 G0). RIGHT: Fabricating a nanocontact. a) Setup to roundly cut the metal wire. The metal wire was sandwiched between a knife blade and a supporting platform. The platform can move in the vertical (Z) and parallel (X) directions with a resolution of ~5 μm. b) SEM image of the nanogap after breakage of nanocontact. Scale bar: 5 μm. c) Optical micrograph of the metal wire with a notch in the middle. Scale bar: 50 μm (d) SEM image of the metal wire. Scale bar: 20 μm. Credit: Light: Science & Applications, doi: 10.1038/s41377-019-0144-z. In the method developed by Zhang et al. light can be used to control electrical conductance at the junction between gold nano-electrodes by heating electrons at the electrode surface, in a technique known as ‘plasmonic heating.’ They validated the experimental mechanisms using simulations. The research team expanded electrodes via plasmonic heating to close the gap and turn the switch on, paving the way to build single-molecule transistors and nanopore-based biosensors at the nanoscale. Molecular junctions were previously investigated as an approach to build nanoswitches by employing photochromic (light sensitive) molecules that switched between two distinct isoforms. The present work by Zhang et al. contrastingly demonstrated conductance switch behavior only with a bare metallic contact, under light illumination, without any molecules. They demonstrated the conductance of bare metallic quantum contacts as reversible switches across eight orders of magnitude to substantially exceed the performance of the previous molecular switches. The scientists were able to adjust the gap size between the two electrodes after the switch process with sub-angstrom accuracy, by controlling the light intensity or polarization. Illumination system with different frequencies. Credit: Light: Science & Applications, doi: 10.1038/s41377-019-0144-z More information: Weiqiang Zhang et al. Atomic switches of metallic point contacts by plasmonic heating, Light: Science & Applications (2019). DOI: 10.1038/s41377-019-0144-z K. Terabe et al. Quantized conductance atomic switch, Nature (2005). DOI: 10.1038/nature03190 Kasper Moth-Poulsen et al. Molecular electronics with single molecules in solid-state devices, Nature Nanotechnology (2009). DOI: 10.1038/nnano.2009.176 Tsuyoshi Hasegawa et al. Atomic Switch: Atom/Ion Movement Controlled Devices for Beyond Von-Neumann Computers, Advanced Materials (2011). DOI: 10.1002/adma.201102597 Scientists have recently developed a light controlled nano-switch to lay groundwork for atomic device development in nanotechnology. They engineered the switches at the nanoscale in a first step toward fully integrated electronic device miniaturization. The multidisciplinary research was conducted by Weiqiang Zhang and co-workers, and an international team of collaborators. Results of the study are now published in Light: Science & Applications. Journal information: Nature To understand how conductance depended on the light intensity, the scientists performed experiments where the maximum light intensity within each illuminated circle gradually increased. Zhang et al. showed that the maximum conductance in each circle increased approximately linearly with the intensity of light. They obtained repeatable data of the current as a function of the light intensity and showed how the conductance of quantum contact, could be regulated by the intensity of light. In the present study, Zhang et al. used this principle to show how a metallic, atomic scale contact could be operated reliably as a conductance switch through controlled illumination of light. To engineer the metallic atomic-scale contact they precisely stretched a metal nanowire using the mechanically controllable break junction. When they reduced the cross-section of the metal wire to a few nanometers or a few atoms, the diameter became comparable to the Fermi wavelength of the electrons, allowing quantum-mechanical effects to strongly influence the properties of electron transport. Using these principles, Zhang et al. showed how the conductance of an atomic gold contact could be switched from a few quanta of conductance to hundreds of quanta, and vice versa with light illumination. The scientists were able to reversibly switch the metallic quantum contacts between the open and closed state by controlling the light intensity. They created a nanogap between the quantum contacts within which coherent tunneling governed electron transport. In-plane coherent control of plasmon resonances for plasmonic switching and encoding Citation: Atomic switches by plasmonic heating of metallic contact points (2019, April 3) retrieved 18 August 2019 from https://phys.org/news/2019-04-atomic-plasmonic-metallic-contact.html Engineering electronic devices using functional building blocks at the atomic scale is a major driving force in nanotechnology to form key elements in electronic circuits, which were previously miniaturized using mechanical tunneling, bias voltage/current operation and electrochemistry. Previous studies did not, however, address the concept of atomic switches controlled by plasmonic heating. Surface plasmons are coherent delocalized electron oscillations at the interface between two materials that form metallic nanostructures, which can be concentrated into the subwavelength gaps between the materials. In principle, when the resonance frequency of surface plasmons match the frequency of the incident light, the plasmon resonance is excited to produce strong light absorption and substantial plasmonic heating. last_img read more

first_imgSeventy militants in Egypt were killed in army raids during the last week, the military said on Sunday.Apart from the 70 killed, 118 wanted and suspected militants were arrested from March 1-7, while 27 militant bases were destroyed, army spokesperson Brigadier General Mohamed Samir said.He added that 108 vehicles and motorcycles used by militants in their attacks against police and army personnel were also destroyed.Egypt’s Sinai region has witnessed many violent attacks by militants since the January 2011 revolution that toppled dictator Hosni Mubarak. The attacks targeting police and military increased after the ouster of Islamist ex-president Mohamed Morsi in 2013.Over 500 personnel have been reported killed since. Military has launched security campaigns in the area, arrested suspects and demolished houses belonging to terrorists.last_img read more

first_imgKolkata: The West Bengal Board of Secondary Education (WBBSE) adopted a zero tolerance policy against students who were caught by invigilators while resorting to unfair means in the Madhyamik Examination this year. The Board has cancelled examination of as many as 73 students in 2019, whereas the number was only 17 last year.”We had adopted a number of measures to curb malpractices during examination and the invigilators were instructed to maintain strict vigil. There were as many as 136 cases of adopting unfair means that were presented before us, among which we exonerated 63. Papers of the other 73 were cancelled. A number of these candidates were caught with mobile phones inside the examination hall,” said Kalyanmoy Ganguly, president of WBBSE. Also Read – Rs 13,000 crore investment to provide 2 lakh jobs: MamataThe number of cases of adopting unfair means presented before the Board last year was 59, among which 17 were cancelled. It may be mentioned that the Madhyamik Examination this year was mired in controversy as question papers of a number of subjects were found circulating on WhatsApp, soon after commencement of the examination. “We had taken strong action against such malpractice. A group that was involved in such an act was unearthed by the police and a number of arrests were made,” Ganguly said. Also Read – Lightning kills 8, injures 16 in stateThe district administration also snapped internet connectivity in a few districts during examination hours, after the police identified a few districts from which such WhatsApp groups had originated. The Board president, however, made it clear that the candidates whose examinations were cancelled, will be allowed to sit for the examination again this year. The Board had earlier threatened to cancel the registration of the candidates who were caught with mobile phones, but later took a soft stand considering the well-being of their career. For the first time this year that sealed packets of question papers were opened in the examination hall by the invigilator and distributed immediately among the students. The decision came in the wake of charges of opening the seal of question papers much before the scheduled time by the headmaster of Maynaguri Subhasnagar High School Haridayal Roy, during last year’s examination. He had allegedly made question papers of more than one subject available to the topper of the school. Roy was subsequently suspended for his act.last_img read more

first_img Growing a business sometimes requires thinking outside the box. Internet-connected toys are a double-edged sword. On the one hand, they can offer access to a wealth of knowledge available online, but you need to trust such devices are secure before giving them to kids. In the case of the My Friend Cayla doll, that’s definitely not the case.In December last year, a complaint was filed with the FTC regarding the My Friend Cayla doll and i-Que robot. Due to an insecure Bluetooth connection included with the doll and robot, a hacker could listen in or even talk to a child through the doll. The doll is manufactured by Genesis Toys and distributed by the Vivid Toy Group in Europe. Apparently it’s possible for the dolls to be updated remotely, but this hasn’t happened and now official German watchdog the Federal Network Agency (Bundesnetzagentur) is advising parents in the country to destroy their My Friend Cayla dolls.As the BBC reports, under German telecoms law the Cayla doll is classified as a “concealed transmitting device.” Coupled with the very strict privacy laws in the country, the doll is basically illegal, hence the push to destroy them.Wherever you are in the world, the advice to not use My Friend Cayla dolls should be heeded. The only problem could be if it’s currently in the possession of a child who would be distraught to lose it. A visit to a toy shop to select a replacement may remedy that, though.  2 min read Register Now » Free Webinar | Sept. 9: The Entrepreneur’s Playbook for Going Global February 17, 2017 This story originally appeared on PCMaglast_img read more

first_imgPHOTO INFORMATION: State Rep. Gary Glenn (R-Williams Township), chair of the House Energy Policy Committee, discusses the bipartisan Energy Freedom legislation during a Tuesday news conference in the Capitol building. Rep. Glenn’s legislation, House Bill 5861, is the main bill to allow homeowners, farmers and businesses the freedom to use renewable energy sources without paying unreasonable tariffs set by the Michigan Public Service Commission. Glenn’s bill will allow more innovative and diverse methods to power buildings while lowering electric bills. Rep. Glenn is joined at the news conference by other sponsors (from right) Rep. Steve Johnson (R-Wayland), Rep. Glenn, Rep. Yousef Rabhi (D-Ann Arbor), Rep. Tom Barrett (R-Charlotte) and Rep. Scott Dianda (D-Calumet). Rep. Glenn plans to have committee hearings on the bill in coming weeks.#### Categories: Glenn News,News Bipartisan bills to get committee hearing in coming weekscenter_img 03May Rep. Glenn leads news conference unveiling Energy Freedom planlast_img read more

first_imgPluto TV has rolled out on Roku in the UK, with the expansion coming just days it made its European debut by launching on Sky’s Now TV platform – also in the UK.The US over-the-top television service, which has a European headquarters in Berlin, will offer more than a dozen channels and a range of entertainment in the UK market.“Right after our European launch it’s now important to connect Pluto TV increasingly to users,” said Olivier Jollet, managing director, Europe, for Pluto TV.“Streaming devices such as Roku players are key to generating instant reach, so we’re thrilled to now offer Pluto TV to Roku users in Great Britain.”“Pluto TV does things a bit differently than other streaming TV services by curating handmade channels for content lovers, once you start to dig around, there’s plenty to discover.”last_img read more

Chinese is love tea, has a very rich tea culture, tea is also a holiday gifts essential products, with the increase of love tea tea shop gradually throughout the country gradually rise, open tea stores more and more investors, want to develop in the market, must master tea stores some management methods and management skills, so that it is more conducive to tea franchise business, in order to take a more long-term tea market. Then it introduces some tea store chain operation small coup for everyone to learn. read more