August 2019

Florida mulls drone war on the mosquito

first_img Citation: Florida mulls drone war on the mosquito (2013, August 14) retrieved 18 August 2019 from https://phys.org/news/2013-08-florida-mulls-drone-war-mosquito.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. Mosquito control professionals in Florida are turning to drones as part of their demanding work to find ways to control mosquito populations. The Keys has over 40 mosquito species; mosquitoes can transmit dengue fever, encephalitis, malaria, and dog heartworm. As the story goes, the first attempt in the Keys toward mosquito control was in 1929, with the setting up of a bat tower. The idea was that the bats would eat the mosquitoes. The bats flew away, but local town wits said the mosquitoes ate the bats. District Director Michael Doyle has invited several government agencies to a test flight on August 26. The drones, which resemble hawks in flight, are from Condor Aerial, of North Carolina; the company will send a rep to operate the test flight. According to the Condor Aerial website, the battery-powered drones are capable of up to 90 minutes of flight at one time. The battery-powered UAV in mind is the Maveric drone, outfitted with a shortwave infrared camera. The drone can fly 90 minutes at a time, is 2.2-pounds and 2.5-feet long. Condor Aerial, with a motto of “Providing Tomorrow’s Technology to Law Enforcement,” has been focused on providing aerial surveillance for law enforcement agencies but Doyle’s interest is to see what the short wave infrared camera can accomplish. According to KeysNet.com, Doyle said that deploying the camera may result in their being able to detect the shallow water areas which the department needs to identify. “If we can find the water, we can kill the mosquitoes. The real challenge is finding the water quickly enough,” Doyle said. Finding the water quickly means the district could move quickly to treat the areas with larvicide. Gene-altered mosquitoes could be used vs. dengue Explore further More information: www.condoraerial.com/FAQ.htmlwww.keysnet.com/2013/08/10/488 … eyes-drones-for.html © 2013 Phys.org (Phys.org) —Drones are often associated with war and running down criminals, but this week drones for another purpose have made news. Florida is about to test how drones will do in tracking down mosquitoes. The Florida Keys Mosquito Control District, in its ongoing mission to make the job of killing mosquitos more efficient, is exploring unmanned aerial vehicles equipped with infrared cameras as one option for mosquito control. The goal is not to use drones to fight the insects but to use the UAVs to spot shallow-water pools where mosquitoes breed, up and down the Keys. Once the pools are found, ground action would begin, with attacks on these pests at the larval stage with larvicides.last_img read more

Xray observations reveal new details about the solartype star HD 209458

first_imgChandra HRC-I image of HD 209458. Credit: Czesla et al., 2017. Located some 160 light years away from the Earth, HD 209458 is a G-type main sequence star very similar to our sun. It has a radius of about 1.2 solar radii and is approximately 13 percent more massive than the sun. The star is orbited by a so-called “hot Jupiter” exoplanet, circling it every 3.5 days at a distance of about 0.047 AU.HD 209458 has a relatively high rotation velocity. With a rotation period of 14.4, it rotates at about twice the solar rate. However, it is a rather inactive star, and despite its critical role in planetary mass loss, the star’s X-ray spectrum and luminosity have not yet been thoroughly studied and remain controversial. Previous measurements of the star’s soft X-ray flux are based on the available data from ESA’s X-ray Multi-Mirror Mission (XMM-Newton) spacecraft, which suffer from significant background contamination, complicating the analysis of HD 209458.So a team of astronomers led by Stefan Czesla of the University of Hamburg, Germany, has complemented the XMM-Newton data with new observations from NASA’s Chandra X-ray Observatory. The combined analysis of the data provided by these two spacecraft allowed the researchers to obtain more details about X-ray properties of HD 209458.”We carry out a detailed analysis of our new Chandra HRC-I data, the available archival XMM-Newton observations and, finally, present a combined analysis of both data sets,” the authors wrote in the paper. The team’s analysis includes XMM-Newton data provided by observations conducted in 2000 and 2006, and a new Chandra dataset obtained thanks to observations carried out in June 2016. All these data deliver crucial information about HD 209458’s coronal X-ray emission and planetary irradiation.According to the study, HD 209458 was confirmed to be an X-ray source. The analysis shows that the star has a coronal temperature of about one million K and an emission measure of approximately 70 quindecillion cm-3, which indicates an X-ray luminosity of about 1.6 octillion erg s-1 in the 0.124-2.48 keV band. The researchers compared these results with the properties of other known stars, including our sun. “With respect to coronal temperature, HD 209458 appears to be comparable to the inactive sun or Cen A,” the paper reads. Furthermore, the team noted that the level of planetary atmospheric irradiation is sufficient to drive planetary evaporation at a rate of a few times ten billion g s-1.”At this level of activity, the planetary high-energy emission is sufficient to support mass-loss at a rate of a few times 1010 g s-1,” the researchers concluded. 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. Explore further Astronomers reveal insights into the nature of a distant ultraviolet-bright star © 2017 Phys.org Citation: X-ray observations reveal new details about the solar-type star HD 209458 (2017, August 21) retrieved 18 August 2019 from https://phys.org/news/2017-08-x-ray-reveal-solar-type-star-hd.html (Phys.org)—By analyzing sets of data obtained by two X-ray space observatories, a team of German researchers has learned new insights into the nature of a solar-type star known as HD 209458. The new study, published Aug. 15 in a paper on arXiv.org, uncovers X-ray properties of the star. More information: arxiv.org/pdf/1708.04537.pdflast_img read more

Mode changing and giant pulses found in a millisecond pulsar

first_imgChandra image of PSR B1957+20. The blue and green are optical images of the field in which the pulsar is found, the green indicating the H-alpha bow shock. The red and white are secondary shock structures discovered in x-ray by the Chandra X-ray Observatory. Credit: X-ray: NASA/CXC/ASTRON/B.Stappers et al.; Optical: AAO/J.Bland-Hawthorn & H.Jones More information: Mode changing and giant pulses in the millisecond pulsar PSR B1957+20, arXiv:1807.01713 [astro-ph.HE] arxiv.org/abs/1807.01713AbstractMany radio pulsars have stable pulse profiles, but some exhibit mode changing where the profile switches between two or more quasi-stable modes of emission. So far, these effects had only been seen in relatively slow pulsars, but we show here that the pulse profile of PSR B1957+20, a millisecond pulsar, switches between two modes, with a typical time between mode changes of only 1.7,s, the shortest observed so far. The two modes differ in both intensity and polarization, with relatively large differences in the interpulse and much more modest ones in the main pulse. We find that the changes in the interpulse precede those in the main pulse by ∼25 ms, placing an empirical constraint on the timescale over which mode changes occurs. We also find that the properties of the giant pulses emitted by PSR B1957+20 are correlated with the mode of the regular emission: their rate and the rotational phase at which they are emitted both depend on mode. Furthermore, the energy distribution of the giant pulses emitted near the main pulse depends on mode as well. We discuss the ramifications for our understanding of the radio emission mechanisms as well as for pulsar timing experiments. Citation: Mode changing and giant pulses found in a millisecond pulsar (2018, July 17) retrieved 18 August 2019 from https://phys.org/news/2018-07-mode-giant-pulses-millisecond-pulsar.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. Canadian astronomers have identified mode changing and giant pulses in the millisecond pulsar known as PSR B1957+20. It is the first time when mode changing mechanism has been observed in a millisecond pulsar. The finding is detailed in a paper published July 4 on the arXiv pre-print server. Radio pulsars showcase various variability in emission ranging from extremely short bursts like giant pulses to long-term changes in their emission profiles. Some of them exhibit even mode changing where the emission profile switches between two or more quasi-stable modes of emission. To date, mode changing has been only observed in normal pulsars.However, a recent study conducted by a team of astronomers led by Nikhil Mahajan of the University of Toronto in Canada, shows the mode changing process could be also present in millisecond pulsars, as they observed that the pulse profile of pulsar PSR B1957+20 switches between two modes. Discovered in 1988, PSR B1957+20, also known as the “Black Widow Pulsar”, is a 1.6 ms eclipsing binary millisecond pulsar in the constellation Sagitta. It orbits with a brown dwarf companion with a period of 9.2 hours with an eclipse duration of approximately 20 minutes. Mahajan’s team observed this pulsar for over nine hours in four daily sessions between June 13 and 16, 2014 at the Arecibo Observatory in Puerto Rico, what resulted in uncovering new insights into its behavior.”Here, we show that the millisecond pulsar PSR B1957+20 shows mode changing, and that the properties of the giant pulses that we found earlier (in the same data; Main et al. 2017) show correlations with the modes,” the paper reads.According to the study, PSR B1957+20 switches between two modes, with a typical time between mode changes of only 1.7 seconds, or approximately 1,000 pulse periods. This is the shortest time between mode changes in pulsar observed so far by astronomers as in regular pulsars these timescales range from minutes to even weeks.The two modes observed in PSR B1957+20 differ in both intensity and circular polarization. They were tagged “high” (more energetic) and “low” (less energetic). The researchers found that the pulsar is in the high mode about 60 percent of the time and in the low mode about 35 percent of the time. The remaining 5 percent of the time was assigned to transition between the two modes.Furthermore, observations conducted at the Arecibo Observatory allowed the astronomers to detect 1,715 giant pulses in PSR B1957+20. They found that the distribution of giant pulses with pulse phase is correlated with mode changing.”We also find that the properties of the giant pulses emitted by PSR B1957+20 are correlated with the mode of the regular emission: their rate and the rotational phase at which they are emitted both depend on mode,” the researchers wrote in the paper.However, the authors of the study noted that additional follow-up observations of PSR B1957+20 at different frequencies are needed to shed some light on the causes of mode changing and giant pulses in this pulsar. © 2018 Phys.org Astronomers observe unprecedented detail in pulsar 6,500 light-years from Earth Explore furtherlast_img read more

Heated crystal flakes can be sewn into clothing for thermotherapy

first_img Citation: Heated crystal flakes can be sewn into clothing for thermotherapy (2019, June 10) retrieved 18 August 2019 from https://phys.org/news/2019-06-crystal-flakes-sewn-thermotherapy.html IR images of the MXene fabric heater formed into a ring, cotton glove, and bracelet. Credit: Park et al. ©2019 American Chemical Society The researchers, led by Chong Min Koo, at the Korea Institute of Science and Technology and Korea University, and Cheolmin Park, at Yonsei University, have published a paper on the shape-adaptable MXene heater in a recent issue of ACS Nano.In recent years, researchers have been investigating different materials to be used as flexible, wearable heaters. Although materials such as carbon nanotubes and graphene have excellent electrical and optical properties, it has been challenging to process them for use in applications.A newer material, MXene was first introduced in 2011 by researchers at Drexel University. MXene is a 2-D crystalline material that exhibits metal-like conductivity and strong electric-to-heat conversion behavior. It can also be easily processed into thin films and fabrics.”We were able to develop novel light-weight, cost-effective but high performance electrical heaters based on emerging 2-D materials of MXene, which are suitable for wearable and on-body applications,” Park told Phys.org. “Several candidates for the purpose have been proposed, based on carbon nanomaterials, but they are restricted by either their poor processability or low electrical conductivity involving harmful and toxic chemicals. We resolved these issues with solution-processed MXene flakes.”In the new study, the researchers first used MXene flakes to fabricate a transparent thin-film heater. Under an applied 15 V, the heater’s temperature increased at a rate of 8°C/second to reach a maximum of 120°C (248°F). By submerging the heater in liquid nitrogen for 5 minutes, the researchers demonstrated that the heater could function as a defroster, rapidly removing the frost on its surface under 12 V. As a demonstration of its high flexibility, the heater could be folded at a 90° angle without any increase in resistance, and continued to function even when folded in half, although with greater resistance.The researchers also demonstrated that the MXene flakes can be used to make heated fabric. To do so, the researchers treated commercial polymer threads with a coating to enhance their electrostatic interaction with the MXene flakes. Then they dipped the threads into a water solution containing MXene flakes. The electrostatic interaction between the positively charged threads and negatively charged flakes caused the flakes to self-assemble onto the individual fibers, turning the white threads black in the process.The MXene-coated threads were then sewn together with cotton to make heated clothing. Under a small voltage, each MXene flake acted as a tiny heater. By controlling the voltage, the researchers could gradually raise the temperature of cold skin back to normal body temperature without damage to the skin. In future applications, the heated clothing could be powered by conventional batteries or alternative power sources.”Potentially, our heater can be powered by the energy stored in batteries and/or supercapacitors from a variety of emerging renewable energy sources, such as wearable solar cells, triboelectric energy generators, and so on,” Park said.The researchers expect that the robust, flexible heated clothing could be useful for healthcare thermotherapy and monitoring, among other personal applications.”Since the MXene flakes we developed with the solution process are highly conductive and optically transparent, a variety of applications are possible, in particular, requiring transparent electrodes,” Park said. “Examples include the development of mechanically flexible and thus wearable organic light emitting diode displays, photodetectors, and transparent touch and/or pressure sensors.” More information: Tae Hyun Park, Seunggun Yu, et al. “Shape-Adaptable 2D Titanium Carbide (MXene) Heater.” ACS Nano. DOI: 10.1021/acsnano.9b01602 © 2019 Science X Network Researchers knit energy-storing clothing fibrescenter_img Journal information: ACS Nano Heated gloves, bracelets, and even rings are some of the potential applications of highly conductive MXene, a 2-D material made of alternating atomic layers of titanium and carbon. In a new study, researchers have fabricated MXene flakes, then electrostatically adhered the flakes to threads, and finally sewed the threads into ordinary fabrics that can be safely heated under a low voltage. Explore further 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

Mass estimated for two binary pulsars

first_img © 2019 Science X Network Mass constraints for PSR J1949+3106. Image credit: Zhu et al., 2019. Citation: Mass estimated for two binary pulsars (2019, July 18) retrieved 18 August 2019 from https://phys.org/news/2019-07-mass-binary-pulsars.html By performing timing observations, an international group of astronomers has measured the mass of two binary millisecond pulsars designated PSR J1949+3106 and PSR J1950+2414. The results could be essential in order to unveil the evolutionary status of these two objects. The research is detailed in a paper published July 11 on arXiv.org. Explore further Gamma-ray pulsations detected from the pulsar J0952−0607 Pulsars are highly magnetized rotating neutron stars that emit beams of electromagnetic radiation. The most rapidly rotating pulsars, with rotation periods below 30 milliseconds, are known as millisecond pulsars (MSPs).Astronomers believe that MSPs are formed in binary systems when the initially more massive component turns into a neutron star that is then spun up due to accretion of matter from the secondary star. To date, more than a half of known MSPs have been found to have stellar companions.Nearly 200 pulsars have been discovered by PALFA, a large-scale survey for radio pulsars at 1.4 GHz using the Arecibo 305-meter telescope and the ALFA multibeam receivers. Recently, a team of astronomers led by Weiwei Zhu of the Max Planck Institute for Radio Astronomy in Bonn, Germany, decided to take a closer look at two MSPs from this survey, namely PSR J1949+3106 and PSR J1950+2414, detected in 2012 and 2013 respectively. The main aim of the study was to measure the proper motions of these two systems more precisely and to measure masses of these objects and their companions.”In this paper, we present the results of timing observations of PSRs J1949+3106 and J1950+2414, two binary millisecond pulsars discovered in data from the Arecibo ALFA pulsar survey (PALFA),” the astronomers wrote in the paper.Initial observations of the two pulsars made by Zhu’s team confirmed that with adequate timing data, it could be possible to perform accurate mass measurements. By analyzing the dataset from Arecibo Observatory and from the North American Nanohertz Observatory for Gravitational Waves (NANOGrav), the astronomers were able to conduct precise calculations of proper motions of both pulsars, what resulted in uncovering the masses of the two systems.According to the paper, the pulsar PSR J1949+3106 was found to have a mass of about 1.34 solar masses, while its companion has an estimated mass of approximately 0.81 solar masses. The observations revealed that PSR J1950+2414 is more massive than PSR J1949+3106, which has a mass at a level of around 1.5 solar masses. However, its companion turned out to have a relatively low mass—only about 0.28 solar masses.The derived masses, together with calculations of proper motions, allowed the team to draw initial conclusions regarding the evolutionary history of both objects.”PSR J1949+3106 is likely the product of a low-kick supernova; PSR J1950+2414 is a member of a new class of eccentric millisecond pulsar binaries with an unknown formation mechanism,” the researchers concluded. More information: W. W. Zhu et al. Mass measurements for two binary pulsars discovered in the PALFA survey. arXiv:1907.05046v1 [astro-ph.SR]: arxiv.org/abs/1907.05046. PDF: arxiv.org/pdf/1907.05046.pdf 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_imgLooking over the photos that accompany this article, Lisa Feldman Barrett, a professor of psychology at Northeastern University and the author of “How Emotions are Made: The Secret Life of the Brain,” homed in on one of a man and two children in V-neck sweaters. The three of them are packed into a roller coaster car, their hair flowing backward, upward and outward in the wind. One child looks peaceful, almost beatific. The other screams mightily. And the man? He looks delighted, maybe partly because there’s nothing quite like watching a kid’s rite of passage. At the bottom of the frame, you can see that the man has put a reassuring hand on the howling child’s arm. “When I look at this picture, I see three completely different facial movements,” says Prof. Barrett. “That’s beautiful. It demonstrates the variability of people’s experience and expressions in exactly the same situation.” Read the whole story: The New York Times With any luck, it never will. It was past midnight when Mr. Doyle left. He was dazed, to put it mildly. The man who’d invented the most brilliant, analytical detective in the history of popular culture had been overwhelmed by the park. One of the few things he managed to say was, “Coney Island doesn’t give one time to think.” — In May 1914, Coney Island played host to an unlikely party of VIPs led by Sir Arthur Conan Doyle and his wife, Lady Doyle. A New York Times reporter trailed the group all day, hoping for a quote from the famed creator of Sherlock Holmes. “First he shot the chutes, then he took the seemingly perilous Whip ride, and finally he went into the ridiculous Crazy Village,” wrote the dutiful journalist. “And he enjoyed it all — particularly the Whip, which he pronounced thrilling.” last_img read more

How to ride the Batmobile wearing a sari

Joshipura took her models to Gotham City – in the land of Batman. The runway was decked up using semi-circular light rings. Monochromes formed the base of the collection marked by the occasional oranges, pinks and limes. Models showed off T-shirts, shorts, trousers, jumpsuits, playsuits, jacket dresses, evening jackets and even a Batmobile dress. Peplums and Arkham patterns, Coolio jackets and digital floral work stood out.

String Magic

first_imgHavells in association with SPIC MACAY organised an evening of Indian Classical Music at Indian Habitat Centre. Khan who is a disciple of Ustad Ali Akbar Khan started the evening with Raga Bageshari Kanada followed by Mishra Mand Raagmala. He was brilliantly accompanied by Vinod Lele of Banaras Gharana.It was a mesmerising musical evening and the audience gave standing ovation to the artistes at the end of the concert. The evening was graced with the presence of other classical artistes such as  Arun Bharat Ram,  Vinay Bharat Ram,  Avinash Pasricha, Sanjeev and Ashwani Shankar, Lakshay and Aayush Mohan Gupta and more.last_img read more

PM to address rally in Midnapore town tomorrow

first_imgKolkata: Prime Minister Narendra Modi will address a farmers rally tomorrow at Midnapore town in West Bengal focusing on the Centre’s recent decision to increase the MSP of Kharif crops. Modi’s rally at Midnapore comes just about a fortnight after BJP national president Amit Shah’s June-29 public meeting in Purulia district. “The prime minister’s rally in Midnapore proves that Bengal is one of our top priority states in the Lok Sabha poll,” West Bengal BJP president Dilip Ghosh said. Also Read – Speeding Jaguar crashes into Merc, 2 B’deshi bystanders killed “We want to felicitate Prime Minister Modiji for his decision to increase the MSP,” he said. The saffron party has made steady inroads in various districts of West Bengal and has emerged as the main opposition party in the state after the recent panchayat elections and bypolls. It is making all efforts to increase its tally in the next general election from the current two. According to state BJP sources, the party is putting special emphasis on the tribal Jungalmahal area where the party won sizeable seats in the last panchayat polls. West Midnapore district is part of the Jangalmahal area.last_img read more

first_imgSituated in the valley surrounded by beautiful hills and lush green areas, the culturally rich North-East regions are widely known for their plays. In order to showcase the magnificence of theatre, the National School of Drama is going to perform plays based on the North-East part of India through the theatre festival ‘Poorvottar Rashtriya Rang Utsav’.A total of five plays consisting of two Manipuri plays, two Assamese plays and one play from Sikkim will be staged first, in New Delhi at the Abhimanch auditorium from August 24-28 before being staged in Amritsar from August 26–30. The party will then move to Jaipur from August 28 to September 1, with the last stage of the tour commencing in Vadodara from August 30 to September 3. Some of the plays that are scheduled to be performed are as Bacchae, directed by Thawai Thiyam of the Manipuri group Chorus Repertory Theatre,  Aeserengaa Rood, directed by  Pranjal Saikia of the Assamese group Sanskritic Mancha and Hami Nai Aafai Aaf, heralded by Bipin Kumar of the Sikkim Centre group.Waman Kendre, Director, National School of Drama, said, “In Indian contemporary theatre, the North-East leads the roost in theatre production. It has made an impact not only on Indian audience but also worldwide. Such theatre practices need to be showcased all over the country in order to enrich theatre enthusiasts, artists, practitioners and the whole community at large.”last_img read more