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. A research group in the UK has crafted a source of single photons – photons emitted one by one – with a convenience and ease of use they liken to “plug and play” computer hardware devices. This is a key step forward in single-photon production, which is essential to successful, secure quantum communication, the transmission of data using individual photons to carry bits of information. Quantum sensor breakthrough using naturally occurring vibrations in artificial atoms Citation: ‘Plug and Play’ Source of Single Photons (2007, March 15) retrieved 18 August 2019 from https://phys.org/news/2007-03-source-photons.html A sketch of the single-photon source with the integrated optical-fiber bundle. The quantum-dot wafer is mounted onto the sample holder (right inset) with the fiber bundle attached directly to its top surface. The “WDM” is the beamsplitter. Explore further The device’s plug-and-play quality lies in its novel design. A bundle of optical fibers is coupled with – or “plugged into,” so to speak – a wafer patterned with quantum dots. Quantum dots are tiny atom clusters of a semiconducting material, such as silicon, that contain as few as a hundred atoms and play a key role in many single-photon-production schemes. In this case, they emit photons when excited with laser light.“Pairing the optical fiber bundle and the quantum-dot wafer presents a way to implement real quantum communication that other single-photon sources do not have,” said lead researcher Xuilai Xu, a scientist at Hitachi Europe Ltd. in Cambridge, to PhysOrg.com. Xu and his colleagues at Hitachi performed the study in collaboration with researchers at the University of Cambridge.The wafer is mounted onto a sample holder, immersed in liquid helium, and then excited with a laser. During this process, the dots’ atoms absorb the laser photons and jump to a higher energy state, but almost instantly re-emit the photons and return to a lower-energy state. The emitted photons travel through the fiber bundle to a beamsplitter, which sends the emitted photons out one fiber and the residual laser photons out another.Accurately determining if the source produced single photons was a tricky task. Xu and his colleagues had to use several devices to analyze the emitted photon signal. These included a spectrometer, which measured the intensity of the light, and two single-photon-counting “photodiodes,” semiconductor devices used to detect light. They also applied a filter to subtract out background photons, ensuring that the photons emitted from the quantum dots were not mixed with photons emitted from the wafer’s “wetting layer,” a thin layer of residue formed on the surface of the dots as the wafer was created.Analysis of the data produced by the measurement and detection devices showed that the photons tended not to be emitted in pairs. And, according to the researchers’ calculations, the addition of the filter, when it was placed at the proper angle, greatly reduced the probability that photon counters would detect more than one photon at once – specifically, the likelihood of this was reduced 100-fold.“This indicates a nearly ideal single-photon source,” said Xu.To test the stability of their design, the group measured the photons emitted from 27 quantum dots, traveling through different optical fibers in the bundle, over a 24-day period. The results showed the photon source to be stable over a timescale of weeks, with no evidence that a considerably longer period would result in degradation.Citation: Xiulai Xu, Ian Toft, Richard T. Phillips, Jonathan Mar, Kiyotaka Hammura, and David A. Williams, “’Plug and play’ single-photon sources.” Appl. Phys. Lett. 90 061103 (2007)Copyright 2007 PhysOrg.com. All rights reserved. This material may not be published, broadcast, rewritten or redistributed in whole or part without the express written permission of PhysOrg.com.
© 2011 PhysOrg.com More information: Influence of coastal vegetation on the 2004 tsunami wave impact in west Aceh, PNAS, Published online before print November 7, 2011, doi: 10.1073/pnas.1013516108AbstractIn a tsunami event human casualties and infrastructure damage are determined predominantly by seaquake intensity and offshore properties. On land, wave energy is attenuated by gravitation (elevation) and friction (land cover). Tree belts have been promoted as “bioshields” against wave impact. However, given the lack of quantitative evidence of their performance in such extreme events, tree belts have been criticized for creating a false sense of security. This study used 180 transects perpendicular to over 100 km on the west coast of Aceh, Indonesia to analyze the influence of coastal vegetation, particularly cultivated trees, on the impact of the 2004 tsunami. Satellite imagery; land cover maps; land use characteristics; stem diameter, height, and planting density; and a literature review were used to develop a land cover roughness coefficient accounting for the resistance offered by different land uses to the wave advance. Applying a spatial generalized linear mixed model, we found that while distance to coast was the dominant determinant of impact (casualties and infrastructure damage), the existing coastal vegetation in front of settlements also significantly reduced casualties by an average of 5%. In contrast, dense vegetation behind villages endangered human lives and increased structural damage. Debris carried by the backwash may have contributed to these dissimilar effects of land cover. For sustainable and effective coastal risk management, location of settlements is essential, while the protective potential of coastal vegetation, as determined by its spatial arrangement, should be regarded as an important livelihood provider rather than just as a bioshield. Citation: Computer model suggests tsunamis could be blunted by coastal trees (2011, November 8) retrieved 18 August 2019 from https://phys.org/news/2011-11-tsunamis-blunted-coastal-trees.html (PhysOrg.com) — One of the biggest problems with tsunamis is that they are so hit or miss. Major ones only occur every ten years or so, and the likelihood of any one place being hit is extremely small. This results in very little preparation being undertaken for such occurrences by people in areas that could be hit. The end result is that when a tsunami does strike, it’s typically devastating. One solution suggested over the years is that coastal communities plant trees between the sea and the community; the idea being that the trees might slow or blunt the force of the waves. Unfortunately, not much work has been done to test this theory, mostly because it’s virtually impossible to predict when and where a tsunami will strike. Now however, a group of German researchers has designed a computer program, as described in their paper published in the Proceedings of the National Academy of Sciences that suggests planting trees really might help lessen destruction and loss of life. Trees won’t stop tsunamis, scientists warn Explore further To get over the problem of not being able to study tsunamis directly, scientists have been turning more and more to computer modeling. Last year for example, a team from Ireland developed a model that helped explain the pendulum effect that can cause bigger waves in some tsunamis. In this latest study a German group working out of the University of Hohenheim has created a model to simulate the devastating tsunami that struck the Aceh part of the Indonesian island of Sumatra in 2004. They replicated both the geography of the area there and the tsunami that struck and then measured the effects of the tsunami, both with and without protective vegetation.As expected the model clearly showed a correlation between damage that resulted and distance from the sea shore i.e. those closest to the sea took the brunt of the force of the waves. When trees were added to the model between the community and the sea however, the model showed an average reduction in destruction of five percent. Smaller plants such as cacao or coffee plants provided less protection, just three percent.The model also showed that if trees are planted behind the community, the destruction tends to be worse as they appear to prevent people from escaping, and provide more dangerous flotsam. It also seems possible that if the trees blunt the force, some of that energy might be bounced back into the community.Unfortunately, despite these findings, it’s not likely that many communities will start covering their shores with dense tree growth, as it would spoil the view; a highly valued commodity in most coastal regions. Indian Ocean (Jan. 2, 2005). A village near the coast of Sumatra lays in ruin after the Tsunami that struck South East Asia. Image: Wikipedia 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 team proposes two main scientific goals for JWST when it comes to observing these moons. The first task would be completing the infrared survey of major satellites. The second goal is geology-related and described as “monitoring surface changes of active satellites.” The researchers presented their proposal in a paper published on the arXiv.”The James Webb Space Telescope will allow observations with a unique combination of spectral, spatial, and temporal resolution for the study of outer planet satellites within our solar system. We highlight the infrared spectroscopy of icy moons and temporal changes on geologically active satellites as two particularly valuable avenues of scientific inquiry,” the scientists wrote in the paper.JWST will be equipped in four scientific instruments: the Near InfraRed Camera (NIRCam), the Near InfraRed Spectrograph (NIRSpec), the Mid-Infrared Instrument (MIRI) and the Fine Guidance Sensor/Near Infrared Imager and Slitless Spectrograph (FGS/NIRISS).These instruments provide a unique opportunity to obtain high spectral resolution infrared spectra from planetary satellites in wavelength regions that cannot be observed from Earth. JWST’s results could complement observations of outer solar system moons conducted by Voyager and Cassini missions.The scientists hope that the telescope’s key scientific contribution could be determining the compositions of giant gas planets’ irregular satellites. They note that even at very low spatial resolution, near-infrared spectroscopy is sensitive to H2O and other ices, as well as silicates and spectral slopes characteristic of complex organic “tholins” (heteropolymer molecules formed by solar ultraviolet irradiation of simple organic compounds such as methane or ethane).”JWST has the sensitivity to provide unique compositional data on irregular satellites. For example, in the one to 2.5 micron region of the near-infrared, amorphous vs. crystalline surface composition of icy bodies could be surveyed extensively using JWST NIRSpec,” the paper reads.Irregular satellites are important sources of dust in the giant planet systems. Dust orbits evolve under effects of radiation pressure and solar tides. By linking the sizes, densities, and albedos of dust particles to the source satellite surface compositions, JWST could offer new insights into the role of these satellites in the production of dust particles. More information: Observing Outer Planet Satellites (except Titan) with JWST: Science Justification and Observational Requirements, arXiv:1511.03735 [astro-ph.EP] arxiv.org/abs/1511.03735AbstractThe James Webb Space Telescope (JWST) will allow observations with a unique combination of spectral, spatial, and temporal resolution for the study of outer planet satellites within our Solar System. We highlight the infrared spectroscopy of icy moons and temporal changes on geologically active satellites as two particularly valuable avenues of scientific inquiry. While some care must be taken to avoid saturation issues, JWST has observation modes that should provide excellent infrared data for such studies. Explore further © 2015 Phys.org How Hubble’s successor will give us a glimpse into the very first galaxies Citation: Scientists plan to observe outer solar system moons using JWST (2015, November 30) retrieved 18 August 2019 from https://phys.org/news/2015-11-scientists-outer-solar-moons-jwst.html The rendering of the James Webb Space Telescope in space. Image credit: Northrop Grumman. Journal information: arXiv The observations of geologic activity of the outer solar system moons, described by Kestay and his colleagues as the second main goal for JWST could also bring remarkable scientific results. The telescope will be able to detect changes on the surface that are indicative of temporal variations in composition and temperature.Many of the outer planet satellites are remarkably active. For instance, Jupiter’s moon Io, Neptune’s largest moon Triton, and Enceladus, Saturn’s icy satellite, have active eruptions. The recent suggestion of active plumes above Europa, orbiting Jupiter, is especially exciting because it may provide samples from a habitable environment that is otherwise extremely challenging to access.The scientists believe that the best moon for these observations would be Io. They note that JWST could observe significant surface changes on this satellite where volcanic activity is very high.”The observations every six months that JWST can make of the Jovian system is very well suited for monitoring the creation and fading of colorful plume deposits on Io which typically happen on a timescales of several months and have diameters of many hundreds of kilometers,” the researchers wrote.They are convinced that JWST observations could also resolve other scientific problems related to Io, such as the eruption temperature of its lavas and the uncertainty about the composition and state of its mantle. This could be crucial to our understanding of how tidal heating works in the Jovian system.The researchers conclude that these two types of JWST observations will enable compelling science of outer solar system moons. They present the telescope as an important tool for studying planetary satellites, underlining that the road to understanding the origins of the universe leads through the observations of our outer solar system. Finally, they encourage the scientific community to use their paper to formulate more specific observation plans. 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. NASA’s James Webb Space Telescope (JWST), often touted as Hubble’s successor, is slated to be launched in 2018 to study every phase of cosmic history, mainly by observing the most distant objects in the universe. The telescope will also be useful for investigating extrasolar planetary systems as well as planets within our solar system. Now, a team of researchers led by Laszlo Kestay, the director of the U.S. Geological Survey’s Astrogeology Science Center, has laid out its plan to use the telescope’s capabilities to better understand our planetary neighborhood by putting emphasis on outer solar system moons and their geology.
Explore further Citation: Catalyst for the carbon-free production of hydrogen gas from ammonia (2017, May 19) retrieved 18 August 2019 from https://phys.org/news/2017-05-catalyst-carbon-free-production-hydrogen-gas.html © 2017 Phys.org The Energy Carriers initiative in Japan is a national project that is specifically looking at ways to efficiently store and transport hydrogen. One way to do this is to use ammonia as a hydrogen source. However, discovery of an efficient process for breaking down ammonia has proved difficult, largely because the catalytic process to break down ammonia requires the continuous addition of heat, which can be prohibitively expensive.Katsutoshi Nagaoka, Takaaki Eboshi, Yuma Takeishi, Ryo Tasaki, Kyoto Honda, Kazuya Imamura, and Katsutoshi Sato of Oita University in Japan have developed a method using a novel catalyst for producing hydrogen from ammonia without the addition of external heat through the catalytic cycle. Their work appears in Science Advances.The decomposition of ammonia into hydrogen and nitrogen is an endothermic process, meaning that it requires the addition of energy to obtain products. This means that traditional catalytic decomposition reactions require the addition of a large amount of heat to obtain a useful amount of hydrogen gas.Nagaoka et al. developed a catalyst that is made of a RuO2 nanoparticle supported on γ-Al2O3 catalyst bed. After purging their catalyst of H2O and CO2, ammonia and oxygen were added to the reaction vessel where ammonia was adsorbed onto the catalytic surface, resulting in an increase in temperature. This increase in temperature catalyzed the oxidative decomposition of ammonia, an exothermic process. This heated up the reaction, which in turn, provided the energy for the endothermic decomposition of ammonia into hydrogen and nitrogen. The catalyst pre-treatment did require heating to remove water and carbon dioxide, but it did not require subsequent re-heating. Tests on catalyst cycling showed that after the initial pre-treatment of the RuO2/γ-Al2O3 catalyst with helium at 300oC, the catalyst was able to cycle three times and still produce hydrogen in maximum yields. Furthermore, these studies included oxidative passivation to ensure that no heat was produced from oxidation of Ru to RuO2. In practice, oxidative passivation will not be necessary. So, even though heating is required to pre-treat the catalyst, heating is not required for additional cycles of the catalyst.In an effort to understand how the RuO2/γ-Al2O3 catalyst works, Nagaoka et al. compared the maximum catalytic bed temperature that results from self-heating of RuO2/ γ-Al2O3 to RuO2/La2O3, a known ammonia decomposition catalyst. They found that the aluminum-based catalyst heated to a maximum temperature of 97oC, while the lanthanum-based catalyst heated to a maximum temperature of 53oC. This is important because the auto-ignition temperature for the oxidative combustion of ammonia is 90oC, and it explains why better reaction yields were seen with RuO2/ γ-Al2O3. The authors point out that this difference in adsorption temperature is likely due to the favorable interaction between ammonia, a basic molecule, and Al2O3, which is a Lewis acid. La2O3, on the other hand, is a Lewis base.Additionally, the authors looked at the difference between using bare γ-Al2O3 as a catalyst and RuO2/ γ-Al2O3. They found that 90% of the ammonia adsorbs onto bare γ-Al2O3 compared to the catalyst bed and the RuO2 nanoparticle. This implies that ammonia is chemisorbed onto the nanoparticle and γ-Al2O3, which then promotes multilayer physisorption. Overall, this type of catalyst is helpful in providing enough heat to overcome the needed heat requirements for the endothermic decomposition of ammonia into hydrogen and nitrogen gas. This study shows that self-heating catalysis is a viable option for exploring solutions to the practical difficulties in using ammonia as a hydrogen fuel source. (Phys.org)—Hydrogen has the potential to provide an alternative, clean energy source, particularly as applied to fuel cell technology. Current fuel sources involve carbon-containing fossil fuels or carbon-containing organic molecules, which result in the production of excess CO2, a greenhouse gas. Several initiatives, including a national initiative in Japan, seek to create a low-carbon usage society by using alternative fuel sources. Credit: Katsutoshi Nagaoka
Jane Goodall is among the most famous researchers in the world today, still nearly a half-century after her groundbreaking work studying chimpanzees in their natural environment in Gombe National Park, Tanzania. Back then, many have noted, the consensus among scientists was that personality traits in animals were invented by amateurs succumbing to anthropomorphism. Goodall was one of the first to suggest very strongly that this was not the case and that animals, particularly chimpanzees, had unique personalities every bit as real as humans. To offer proof, she and her colleagues took and administered tests to one another that served to classify the personality traits they found in the chimps they were studying. Each of the researchers was asked to rate each of the chimps under observation regarding their personalities for such things as how aggressive or trustful they found them. Since that time, a lot of research has been conducted regarding animal personalities and the consensus has changed—now, it is believed that most animals have unique personalities. In this new effort, the researchers have revisited the histories of the same chimps that were tested in the 1970s and have tested other chimps to learn more about the stability of personality traits as the chimps live their lives over many years.The researchers used different tests, but note the categories in the new tests could be correlated with traits on the original tests. To learn about trait stability in the original chimps (most of which have died), the researchers asked people who had studied them over the years to take the tests. In addition, they also asked other workers studying other wild chimps to take the tests at different points in time. The researchers then compared the personality scores for all of the chimps across multiple time periods. They report that they found remarkable consistency. While there were some caveats and some minor changes due to accumulation of wisdom as the chimps aged, their basic personalities, like those of humans, remained intact. 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. More information: Alexander Weiss et al. Personality in the chimpanzees of Gombe National Park, Scientific Data (2017). DOI: 10.1038/sdata.2017.146AbstractResearchers increasingly view animal personality traits as products of natural selection. We present data that describe the personalities of 128 eastern chimpanzees (Pan troglodytes schweinfurthii) currently living in or who lived their lives in the Kasekela and Mitumba communities of Gombe National Park, Tanzania. We obtained ratings on 24 items from an established, reliable, well-validated questionnaire used to study personality in captive chimpanzee populations. Ratings were made by former and present Tanzanian field assistants who followed individual chimpanzees for years and collected detailed behavioral observations. Interrater reliabilities across items ranged from acceptable to good, but the personality dimensions they formed were not as interpretable as those from captive samples. However, the personality dimensions corresponded to ratings of 24 Kasekela chimpanzees on a different questionnaire in 1973 that assessed some similar traits. These correlations established the repeatability and construct validity of the present ratings, indicating that the present data can facilitate historical and prospective studies that will lead to better understanding of the evolution of personality in chimpanzees and other primates. A team of researchers affiliated with institutions in the U.S., the U.K. and Tanzania has found evidence that suggests personality traits in chimpanzees are relatively stable over long periods of time. In their paper published in the journal Scientific Data, the group describes the history of the testing, the types of tests given and what they revealed. © 2017 Phys.org Credit: CC0 Public Domain Citation: Testing chimps in Tanzania over decades suggests personality types are stable (2017, October 26) retrieved 18 August 2019 from https://phys.org/news/2017-10-chimps-tanzania-decades-personality-stable.html New research suggests apes have human-like personalities
Abiding by Gandhiji’s message of peace and the importance of sensitising young minds to it, the college chose the fest theme as the exuberant Colours of Peace. The chief guest of the event was renowned film actor and Padma Bhushan awardee Sharmila Tagore; guests of honour were film director Anusha Rizvi, and film actor Naseer Abdullah. Speaking on the occasion, chief guest Sharmila Tagore gave an inspirational speech on peace and on the spirit of democracy. She talked about how peace is a continuous process, and a pursuit which one should never abandon. She quoted from Pablo Neruda’s Prayers for the Earth emphasising how important it is to sustain the fabric of democracy, secularism and freedom. Her address was followed by Naseer Abdullah’s heartfelt rendition of KL Saigal’s Suno Suno Aye Krishna Kala. Also Read – ‘Playing Jojo was emotionally exhausting’The spirit of the fest came alive with cultural performances by the college students. The music society of the college sang a mesmerizing sufi song which was equally matched by the song sung by the western music society girls. A classical dance rendition of Kalidasa’s Ritusamhara performed by the Indian classical dance society, Nupur, captivated the audience, making them experience the joy of different seasons and exuberance of life. The show stopper was a scintillating performance by the Nritya, dance society students, on the famous Hindi film songs of Sharmila Tagore. She was highly impressed by the performance and thanked the entire college for such a heartfelt tribute. Also Read – Leslie doing new comedy special with NetflixParticipated by students across all DU colleges, the fest included various competitions ranging from Euphonie-Western music competition, Question and answer quiz show, Sanskrit recitation to Footloose-dance competition. The second day too continued with much excitement and immense participation from various colleges. The events of the day were Jabberwocky- Turncoat Debate, Bardoratory- Soliloquies in Shakespeare’s Plays, Create from Waste and many more. Live performance by Stereo Nation aka Taz thrilled and mesmerized the crowd.
Children tend to perceive ovoid, or egg-shaped, characters as overweight even though the creatures are imaginary, and seeing them can influence children to eat more unhealthy food, found the study.“They have a tendency to eat almost twice as much indulgent food as kids who are exposed to perceived healthier looking cartoon characters or no characters at all,” said lead author of the study Margaret Campbell, marketing professor at the University of Colorado Boulder in the US. Also Read – ‘Playing Jojo was emotionally exhausting’The results of the study published in the Journal of Consumer Psychology said that, kids are responsive to the apparent bodyweight of cartoon characters like the aptly named Grimace, a rotund, milkshake-loving creature created by McDonald’s restaurant in the 1970s.The findings, gathered from over 300 participants in three age groups averaging eight, 12 and 13 years, have implications for marketers as well as parents navigating a world where children encounter cartoon characters in a variety of media, from books to graphic novels, TV shows, video games, movies and more. The inclination to eat more junk food was curtailed, however, when kids in the study first had the opportunity to summon their previously learned health knowledge.“Kids do not necessarily draw upon previous knowledge when they are making decisions. But perhaps if we are able to help trigger their health knowledge with a quiz just as they are about to select lunch at school, for instance, they will choose the more nutritious foods,” said Campbell.
Kolkata: Suvendu Adhikari, the state Transport minister, will hold a meeting at Behala Tram depot on Wednesday to ensure availability of more number of buses in the southern fringes of the city.The state Transport department has already deployed additional buses in the area to help people until normalcy in the area is restored after the caving-in incident of the Majerhat bridge. The state Transport department will be engaging small- size buses that the locals of the area can avail to reach their destinations. Also Read – Rain batters Kolkata, cripples normal lifeSources said that the Transport minister will be taking stock of the present situation in the meeting and decisions on necessary steps would also be taken to ensure that people do not face any inconvenience in reaching their destinations when vehicles are diverted in the absence of the Majerhat bridge. The minister will be discussing the issues in this regard with senior officials of his department.This comes at a time when the Kolkata Traffic Police are taking all necessarysteps to ensure smooth flow of vehicles. At the same time, the state government is also taking necessary measures to construct alternate roads as early as possible and talks with the Railway authorities are also on in this connection.
Kolkata: Two bikes collided with each other near Judicial Academy in New Town on Wednesday morning.One of the bikers identified as Sariful Shaikh, who is a delivery person of Swiggy, got serious head injuries and is admitted to a city hospital. The condition of the delivery person is stated to be serious. Locals told Shaikh was riding his bike at a high speed and eventually lost his control. Keeping in mind the extent of the damage, Bidhannagar Police is soon going to arrange a meeting with the food delivery agencies over the issue of rash driving by Also Read – Rain batters Kolkata, cripples normal lifedelivery persons. According to locals, Shaikh was coming from the Sapoorji area and was headed towards Narkelbagan. Near Judicial Academy, Shaikh failed to notice the speed breaker placed on the road. He crossed over the speed breaker at a high speed. Meanwhile, another bike was taking a U turn just a few meters ahead of him. As Shaikh was a high speed, he collided with the bike that came infront of him and fell on the road. The other biker also fell off the bike but suffered minor injuries. Also Read – Speeding Jaguar crashes into Mercedes car in Kolkata, 2 pedestrians killedShaikh was immediately removed to a private hospital near New Town police station and was later shifted to another private hospital near Haldiram’s. In the evening, he was again shifted to another hospital at Mullick Bazar, specialised for neurological treatment. It is alleged that food dilvery apps such as the likes of Swiggy often takes action if a delivery person fails to deliver the food within a stipulated time. They also pay some amount of money as commission for faster delivery of food. To comply with the policy and make some extra amount, delivery persons are frequently seen flouting traffic norms that results in self-harm or harm of others. The delivery persons ride very fast to reach their destinations in fear of getting penalised. “We do not encourage anyone to flout traffic norms or ride fast. There is no provision of imposing penalties,” said a Swiggy official. According to the sources, in Wednesday’s accident Shaikh’s bike had no insurance and as a result, he will not get any compensation. Police sources said after the Swiggy authority was informed about the accident, they avoided taking any liability because Swiggy has no social security scheme for their delivery persons. To sort the matter, Bidhannagar Police will call the food delivery agencies and mention some guidelines that need to be followed strictly. The agencies will also be asked to keep a periodical check of the delivery persons’ bikes and the related vehicle documents. “We will sit with the food delivery agencies and their delivery persons to ensure there is no over-speeding and rash driving by them,” said Amit P Javalgi, Deputy Commissioner of Police (Headquartes) of Bidhannagar Police.