Two More Earths Chandler Wobble Jumps Revealed Last in 2005

first_img(PhysOrg.com) — The Chandler Wobble is a small variation in the rotation of the Earth on its axis. It has been known for some time that the phase of the Chandler Wobble jumped by 180 degrees in the 1920s, but a new study by scientists at the Russian Academy of Sciences has found that the same thing also happened in 1850 and 2005. But no one knows why. Tracking Earth’s wobbles down to the size of a cell phone Any sphere that is not perfectly spherical has a slight wobble when it spins, rather like the effect you see as a spinning top is slowing down. The Earth’s wobble was discovered in 1891 by an American astronomer called Seth Carlo Chandler, and is named after him. The Chandler Wobble is one of the main components of the movement of the Earth’s axis of rotation relative to the surface of the Earth. Because the axis passes through the polar regions, this motion is also called Polar Motion. The amplitude and phase of the Chandler Wobble change over time, which is widely believed to be caused largely by pressure fluctuations at the bottom of the oceans. The pressure changes result from ocean circulation currents, and variations in temperature and salinity. This theory explains small changes in phase and amplitude, but in the 1920s the Chandler Wobble phase suddenly jumped by 180 degrees, which cannot be explained by gradual variations in pressure.Scientists working at the Central Astronomical Observatory in Pulkovo near St Petersburg recently analyzed all the data on the Earth’s rotation provided by the IERS (International Earth Rotation and Reference Systems service). The period of available data covered the last 163 years. The study looked for variations in the amplitude and phase of the Chandler Wobble. The results showed that the phase and amplitude often change by small amounts, but the scientists also discovered there were two other occasions when the phase jumped by 180 degrees: in 1850, and in 2005. A deep decrease in amplitude coincided with each phase jump.The scientists, Zinovy Malkin and Natalia Miller were studying the anomalies in the Earth’s rotation, especially as seen by the moving axis at the poles, because understanding these anomalies could help us understand changes in the Earth’s surface and interior and in the atmosphere and oceans. They used several methods of analysis to ensure their results were reliable, but they were not able to explain the reasons for the sudden dramatic changes in phase and amplitude.More information: Chandler wobble: two more large phase jumps revealed, arxiv.org/abs/0908.3732via MIT Technology Review© 2009 PhysOrg.com Explore furthercenter_img 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. Citation: Two More Earth’s Chandler Wobble Jumps Revealed, Last in 2005 (2009, September 2) retrieved 18 August 2019 from https://phys.org/news/2009-09-earth-chandler-revealed.htmllast_img read more

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Research team devises a way to create pulses of gamma rays with

first_img(Phys.org) —A team of researchers based at Texas A&M University with affiliations with several Russian Universities has come up with a way to create pulses of gamma rays that have precise shapes and timing, all from a single photon source. In their paper published in the journal Nature, the team describes how they used cobalt to produce coherent single photon pulses. More information: Coherent control of the waveforms of recoilless γ-ray photons, Nature (2014) DOI: 10.1038/nature13018AbstractThe concepts and ideas of coherent, nonlinear and quantum optics have been extended to photon energies in the range of 10–100 kiloelectronvolts, corresponding to soft γ-ray radiation (the term used when the radiation is produced in nuclear transitions) or, equivalently, hard X-ray radiation (the term used when the radiation is produced by electron motion). The recent experimental achievements in this energy range include the demonstration of parametric down-conversion in the Langevin regime1, electromagnetically induced transparency in a cavity2, the collective Lamb shift3, vacuum-assisted generation of atomic coherences4 and single-photon revival in nuclear absorbing multilayer structures5. Also, realization of single-photon coherent storage6 and stimulated Raman adiabatic passage7 were recently proposed in this regime. More related work is discussed in a recent review8. However, the number of tools for the coherent manipulation of interactions between γ-ray photons and nuclear ensembles remains limited. Here we suggest and implement an efficient method to control the waveforms of γ-ray photons coherently. In particular, we demonstrate the conversion of individual recoilless γ-ray photons into a coherent, ultrashort pulse train and into a double pulse. Our method is based on the resonant interaction of γ-ray photons with an ensemble of nuclei with a resonant transition frequency that is periodically modulated in time. The frequency modulation, which is achieved by a uniform vibration of the resonant absorber, owing to the Doppler effect, renders resonant absorption and dispersion both time dependent, allowing us to shape the waveforms of the incident γ-ray photons. We expect that this technique will lead to advances in the emerging fields of coherent and quantum γ-ray photon optics, providing a basis for the realization of γ-ray-photon/nuclear-ensemble interfaces and quantum interference effects at nuclear γ-ray transitions. Gamma rays have quite a bit more energy than regular light, and their wavelength is a lot shorter too—both attributes that could make them an ideal candidate for better data communications and other physics applications. Unfortunately, they are not as easy to produce and harness as regular light. In this new effort, the researchers looked to radioactive Cobalt as a possible solution.Normally, cobalt-57 releases pairs of photons one after the other as it decays to iron-57—the waveforms of the photons spread across time and exponentially decay. As part of their experiment, the researchers instead caused a photon to be absorbed into the nucleus of an iron atom using a sheet of steel foil, which also allowed for detection of the photon as it was later released. By vibrating the foil, the researchers found they were able to cause the photons to be absorbed at different distances from the source. This meant the reemergence of the photon as it was released could be caused to take different amounts of time to strike the detector. By changing the vibration frequency, the team found they were able to adjust the amount of time it would take the photon to strike the detector.The result of the experiment was that the researchers discovered that they were able to use the vibrating motion of the foil to create a wave form as a series of fading, coherent pulses that were all evenly spaced apart. By adjusting the vibration characteristics, the researchers found they could fine tune the number, duration and shape of the pulses—they could even produce pairs if desired. Put another way, the researchers efforts have resulted in a method for both producing and harnessing the energy in gamma rays.Possible uses for such technology range from improving spectroscopy devices, to new quantum cryptography techniques to increased high-speed data communications. Explore further © 2014 Phys.org Journal information: Naturecenter_img Experimental set-up for γ-photon waveform control. Credit: Nature (2014) doi:10.1038/nature13018 Hi-fi single photons 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. Citation: Research team devises a way to create pulses of gamma rays with precise shape and timing (2014, March 17) retrieved 18 August 2019 from https://phys.org/news/2014-03-team-pulses-gamma-rays-precise.htmllast_img read more

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Magic of plenty

first_imgWills Lifestyle Fashion Week’s Day 3 showcased variations on the ramp. Whites, prints on solid bright colours and eye catching accessories sizzled the ramp. We saw an interesting trends for this summer in many shows like hand bands, gold bangles,  geometric prints, chirpy colours and more. Designer Payal Pratap’s collection something we adored as she redefined the lace saree. Bodice by Ruchika Sachdeva marked earthy tones like peach, brown and different shades of white for this summer. Namrata Joshipur metallic assemblage gave day three a twist.  Designers who showcased their work on day three includes- Niket and Jennie, Rajdeep Ranawat, Pratima Pandey, Dev R Nil, Payal Pratap, Zubir Kirmani, Namrata Joshipur and day ended with a show by Rohit Gandhi and Rahul Khanna. Stay tuned for the final 2 days!last_img read more

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Creating art impressions

first_imgA group exhibition titled Creating Impressions that displays the works by contemporary artists on graphics, is being organised in the Capital by Art and Aesthetic.The participating artistes are – Abesh Biove Mitra, Anamika Prakash, Anant Nigam, Chandrashekar Waghmare, Chhering Negi, Dattatraya Apte,  Kavita Naya Praveen Hatwar, Subba Ghosh, Vibhuti Sharma, Yashpal Chandrakar and Yogesh Rawal.Graphics, generally known as prints, is a highly under-rated and under-valued medium of visual expression in the discipline of art. To evoke curiosity in its processes and draw interest towards its sensibilities, Art and Aesthetic has brought up this show to support the practice of printmaking by showcasing and promoting prints consistently.    Also Read – ‘Playing Jojo was emotionally exhausting’The obsession with owning an ‘exclusive’ or ‘one and only’ somewhat dilutes the desire to acquire limited edition prints, undermining the laborious processes involved and inherent character of multiplicity in the tradition of printmaking.In the contemporary scene, printmaking is a multi–faceted art with overlapping processes, the new processes coming into being while old technologies being re- visited. However, in the ever-evolving scenario, the medium retains its own unique character and aesthetics. Also Read – Leslie doing new comedy special with NetflixThe process of image making in the reverse (mirror image) by Creating Impressions from one surface (zinc plate, litho, lino etc) to another surface (paper), while observing technical integrity and fulfilling creative aspirations and integrating the accidental effect in the image thereof, is not only challenging and intriguing for the print-maker but also fascinating for an inquisitive spectator. Further, dissemination of creative visual imagery conforms to the original purpose of making limited editions prints thereby lending credence and significance to this invaluable tradition.   Where: Art and Aesthetics Gallery, Lado Sarai Timings: 11 am – 7pm  When: On till 4 Octoberlast_img read more

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8hour duty minimum for all docs in staterun hospitals medical colleges

first_imgKolkata: The state Health department has issued a notification, announcing the new duty schedule for doctors at all the medical colleges, mandating the doctors to devote 8 hours per day.The new duty rosters will be corroborated with biometric attendance system, which the state government has proposed to introduce.One of the main objectives is to fix the accountability of the doctors at the state-run hospitals and thereby to ensure better health services to a huge number of patients, who depend on the government establishments. Also Read – Heavy rain hits traffic, flightsAccording to the government notification, the doctors have to devote a minimum of 48 hours in a week. They will be able to avail an off day in a week, as per the roster. The on-call duty of the registered medical officers (RMO) and the junior doctors are, however, not included within the prescribed duty hours.If duty hours are less than 8 hours a day and more than 7 and half hours, it will be marked as half CL (casual leave) for the doctors. If the duty hours are less than 7 and half hours a day, it will be marked as absent. Also Read – Speeding Jaguar crashes into Merc, 2 B’deshi bystanders killedIf there are more than 14 CLs in a year for any individual, they will be adjusted from EL (earned leave). If ELs are exhausted, penalty will be deducted from salary. If a doctor exhausts all his/her leaves, he/she may be deprived of salary.The notification also says that the first shift for doctors will be between 9 am – 5 pm. If a doctor joins duty 15 minutes after the shift starts, he/she will be marked as late and he will be liable to join the next shift starting from 9.30 am. The next shift will start from 10 am and will continue till 6 pm, while the last shift will continue from 11 am to 7 pm. All the principals and medical superintendents have been instructed to conduct fingerprint enrollment under the biometric attendance system. All the city’s medical college hospitals will conduct the enrollment for two days from June 13-14. North Bengal Medical College and Hospital and Midnapore Medical College and Hospital will also carry out the enrollment on the same days.Beliaghata ID Hospital, Bangur Institute of Neuroscience, Regional Institute of Ophthalmology, School of Tropical Medicine and BC Roy Institute of Pediatric Science will hold enrollment on June 15, whereas Burdwan Medical College and Hospital, Murshidabad Medical College and Hospital, Malda Medical College and Hospital and College of Medicine and Sagore Dutta Hospital will hold the enrollment for two days on June 18 and 19.There were some complaints coming from the medical colleges that some doctors do not visit the hospitals on a regular basis, while some others do not enter the hospitals on time, affecting the health services.It may also be mentioned that biometric attendance system has already been installed in various government departments. Now, the doctors at the state-run medical colleges and hospitals and in the districts will also be brought under the ambit of the system.last_img read more

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Five killed 35 injured in separate accidents

first_imgKolkata: Three persons including two policemen were killed when a car rammed into a stationery truck from behind in Nadia’s Nakashipara area on Monday morning, while in a separate accident, a woman and a child died and some 35 got injured that took place in Hooghly district.The death toll has reached five while several others have been stated to be in serious conditions. According to the Nadia district police, the accident occurred on National Highway 34. Deceased have been identified as Tarun Kumar Das, Md Mashud and Pravash Mahato. Mahato was the driver of the vehicle in which the two police men were travelling. Satyabrata Bhowmik, another police personnel travelling in the car, has been undergoing treatment in Shakti Nagar District Hospital in Krishnanagar. He was later shifted to a hospital in the city as his condition deteriorated. Also Read – Speeding Jaguar crashes into Merc, 2 B’deshi bystanders killedIt was learnt that they were coming to Kolkata from Raigunge. When the car was crossing Gacha Bazar area under Nakashipara police station, the vehicle hit a truck from behind.All the three victims died on the spot. According to a preliminary investigation, the police suspect that the driver might have fallen asleep when the accident occurred. The exact cause of the accident is yet to be confirmed. The circumstantial evidence suggests that the vehicle was at a top speed at the time of the accident. The bodies were later sent for the post-mortem. The incident caused traffic congestion on National Highway 34 after the incident. The situation was brought under control following the intervention of senior police officers. They seized both the truck and the car. Also Read – Naihati: 10 councillors return to TMC from BJPThe other accident took place in Joyrampur area in Hooghly where a bus carrying 45 odd passengers overturned and fell into a road side ditch killing a woman and a child and injuring35 others.The injured victims were taken to Arambag Sub-Divisional hospital for treatment. Some of the injured passengers are stated to be in serious conditions. According to a preliminary investigation, the police suspect that the bus was over speeding and this led to the accident.last_img read more

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Delhi govt announces trams for Old Delhi

first_imgTrams will run in the Walled City of the national Capital for better connectivity, the Delhi government announced on Tuesday.Although the government did not set any deadline, it said that trams would run in areas like Red Fort, Jama Masjid, Old Delhi and New Delhi railway station. The AAP government also said more powers would be given to Shahjahanabad Redevelopment Corporation on the lines of the New Delhi Municipal Council and Delhi Cantonment Board.“To implement its plans, the corporation will need proper powers; so we will be equipping it with powers for enforcement,” Deputy Chief Minister Manish Sisodia said after visiting Chandni Chowk area in the capital.Set up during the Congress government, the Corporation was tasked with restoring the area to its Mughal-era glory.last_img

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Why angry people are poor in communication

first_imgPeople with intermittent explosive disorder (IED), or impulsive aggression, have a weakened connection between regions of the brain associated with sensory input, language processing and social interaction, the findings showed.In a new study published in the journal Neuropsychopharmacology, the scientists showed that white matter in a region of the brain called the superior longitudinal fasciculus (SLF) has less integrity and density in people with anger issues than in healthy individuals and those with other psychiatric disorders.  Also Read – ‘Playing Jojo was emotionally exhausting’The SLF connects the brain’s frontal lobe– responsible for decision-making, emotion and understanding consequences of actions–with the parietal lobe, which processes language and sensory input.“It’s like an information superhighway connecting the frontal cortex to the parietal lobes,” said lead author of the study Royce Lee, Associate Professor at University of Chicago in the US. “We think that points to social cognition as an important area to think about for people with anger problems,” Lee said. Lee and his colleagues, including senior author Emil Coccaro, MD, Ellen C. Manning Professor and Chair of Psychiatry and Behavioral Neuroscience at Chicago.  Also Read – Leslie doing new comedy special with NetflixFor the study, the researchers used diffusion tensor imaging, a form of magnetic resonance imaging (MRI) that measures the volume and density of white matter connective tissue in the brain. Connectivity is a critical issue because the brains of people with psychiatric disorders usually show very few physical differences from healthy individuals.“It’s not so much how the brain is structured, but the way these regions are connected to each other,” Lee said.last_img read more

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City observes Saraswati Puja with traditional pomp gaiety

first_imgKolkata: The onset of spring, with blooming flowers and vast fields of ripened mustard, brings with it the Hindu goddess of knowledge, music and culture. Heralding the arrival of Basant Panchami, the City of Joy celebrated the occasion of Saraswati Puja on Saturday with traditional pomp and gaiety.Decked up in bright hues of yellow saris, women and girls offered their prayers to Goddess Saraswati with flowers, while men chose to follow the age-old tradition and clad themselves in traditional white kurtas. Clay idols of the Hindu goddess with a veena in one hand, a crescent moon on the brow and a swan at her pedestal, were seen with flowers, fruits and sweets placed as offerings in front of her. Also Read – Bose & Gandhi: More similar than apart, says Sugata BoseThe ritual which is typically performed by priests in different households, clubs, communities, schools, and colleges, continued throughout the day with the ringing sounds of cymbals and conch shells, after which the devotees indulged in distributing ‘prasads’. With the growing popularity of the occasion, small marquees had come up in almost every nook and cranny, where people gathered to worship the goddess, followed by a sumptuous lunch comprising “khichuri” which is a mixture of rice and lentils, accompanied by fried vegetables and dollops of chutney and sweets. Also Read – Rs 13,000 crore investment to provide 2 lakh jobs: MamataTo add a cherry on the cake, this year the occasion has become a two-day affair as the ‘tithi’ which started on Saturday will last till Sunday 10 am in the morning. The state government has also declared a holiday on Monday. The day which is considered to be the Valentines’ Day for Bengalis saw couples flocking to different malls, parks and restaurants, on completion of the puja. But for the little ones, it was a day of exulted euphoria who gave their textbooks a miss for a day just before their upcoming examinations, providing them with much-needed respite. On Saraswati Puja, which is also considered to be a “no-study day”, the children participated in cultural functions organised in localities, educational institutes and households.last_img read more

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Aahar 2018 India feeding the world

first_img“There is an urgent need to explore the full-potential of processed food and hospitality sectors as these sectors are imperative, not only for India ‘s socio-economic progress but also for enhancing exports and employment in the country. The Government has geared up to launch a ‘pro-farmer based agri-policy’ to ensure farmers are encouraged to imbibe value addition of their produce and connect with the export activity directly. They can become an integral part of retail and supply chain globally. Events such as ‘AAHAR’ are vital in providing an excellent platform for all the stakeholders to have meaningful interaction, collaboration and investment opportunities,” asserted Suresh Prabhu, Union Minister of Commerce and Industries, Government of India, while inaugurating the 33rd edition of AAHAR – the international food and hospitality fair – on March 13 at Pragati Maidan, New Delhi. Also Read – Add new books to your shelfIn his inaugural speech, the Minister complimented the India Trade Promotion Organisation (ITPO) and its associates for hosting Aahar 2018. Expressing his satisfaction with redevelopment project of Pragati Maidan he said that such an iconic infrastructure is imperative to fulfil “New India” aspiration.AAHAR is a one-stop solution for catering Indian delicacies to the international platter. It is a visionary of transforming India globally and is giving an international platform to Indian SME’s to the global market. The fair will go on till March 17, 2018. Also Read – Over 2 hours screen time daily will make your kids impulsiveHighlighting vast export potential of marine sector products, the Minister mentioned that there are 13 coastal states in India with abundant marine products. He indicated that a comprehensive roadmap is being prepared by the government to double the exports of marine products soon. Referring to the participation of Japan in the fair, he pointed out that India has to adopt Japanese innovations and technology to provide a fillip to the marine sector through value addition and preservation practices of marine products. Stressing on the need to vitalize the hospitality sectors, he indicated that the fair is devoted to ‘food’ and ‘hospitality’ which are an integral part of India’s ancient heritage and culture with the world-famed slogan ‘Athithi Devo Bhava’. “The country registered 17 to 20 percent increase in the aviation market last year, we have to prepare ourself in providing quality services in hospitality including conducive air travel and cargo facilities”, he further added. This edition of AAHAR has much to offer to the world with 18 foreign countries participating, who are masters of food export industry. USA, China, Italy, Japan, Tunisia, Poland, Turkey, Spain, Oman, South Korea, Thailand, UAE, Peru, Indonesia, Canada, Hongkong, Norway, Singapore brings their best techniques and products to share with the world. Present on the occasion were Jacek Bogucki, First Deputy Minister of the Ministry of Agriculture and Rural Development of the Republic of Poland, Nejmeddine Lakhal, Ambassador of the Republic of Tunisia, Mitsuhiro Miyakoshi, Special Advisor to the Prime Minister of Japan, LC Goyal, CMD, India Trade Promotion Organisation (ITPO), Narendra Kumar Singh, CMD, APEDA and Deepak Kumar, Executive Director, ITPO. LC Goyal in his key address said that the redevelopment project of Pragati Maidan as a world class ‘International Exhibition-cum-Convention Centre’ is on the right track. “The next AAHAR edition will be organized with its enhanced scale as new halls would be available in February/March 2019”. An exclusive Culinary Art Competition would be organized by the Indian Culinary Forum in Lounge B (near Gate 1) while other major attractions are exclusive seminar in Hall 8 (Auditorium) on “The Role of R&D and Food Safety in the Development of Food Processing Sector” by AIFPA (at 9 am on March 14).The fair has been organized by the ITPO with the support of Ministry of Food Processing and Industries, Government of India, APEDA along with other apex bodies such as AIFPA, ARCHI, HOTERMAI, FHSAI and FIFI for the fair.AAHAR is open for the business visitors from 10 am to 6 pm every day until March 17. Visitors can park their vehicles at Bhairon Road parking.last_img read more

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