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2018年12月12日星期三
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mandeep - 30-year-old architect shot dead in Ludhiana
A 30-year-old man, an architect by profession, was shot dead by a bike-borne man in Dugri, Phase 1, on Thursday morning. The assailant was caught on a close circuit television (CCTV) camera installed near the crime spot. According to the police, the shooter fired four shots to kill Mandeep Singh alias Pardeep of Khanna Enclave, Dhandra Road.
The police suspect victim’s illicit relation with a married woman to be the reason behind the murder. Victim’s brother Surmeet Singh filed a complaint against Balwinder Singh of Guru Angad Colony, alleging that he (Balwinder) was threatening the family and had given contract to kill Mandeep.
Mandeep worked with a company, Well Design, based in Janta Nagar. On Thursday at around 9.27am, Mandeep visited a construction site in Phase 1, Dugri. The footage of the CCTV camera shows the shooter carrying out a recce of the area twice. At 9.30am, the shooter parked his bike near victim’s car and waited for half an hour. At around 10am when Mandeep was going to sit in his car, the shooter walked towards him and fired four shots at him from the rear and fled the scene on his bike.
Mandeep collapsed on the road. Residents came to his rescue and made him sit on a chair. “When I came outside, I saw a man lying on the road. I raised an alarm and also sprinkled water on his face. When the victim regained consciousness, he stated that he has been attacked. We rushed him to a hospital where he was declared brought dead,” said a woman, who was among the first ones to reach Mandeep.
Commissioner of police Sukhchain Singh Gill said that on the complaint of Surmeet, Balwinder has been booked for murder. “But we are investigating. The man who killed Mandeep has also been identified but his identity will be disclosed later,” he said.
Victim’s brother Surmeet said, “For around two years, we were being threatened by Balwinder. I used to advise my brother to stay away from the woman he was seeing,” he said.
Mandeep is survived by an elder brother, a younger sister and mother.
Family was to move into new house tomorrow
Mandeep’s family was to shift to a new house in Shaheed Bhagat Singh Nagar on Saturday and all members were busy making preparations. Victim’s mother was inconsolable at the hospital. The family was also looking for a match to Mandeep’s younger sister and planning to get her married by next year.
Business hub turning into crime capital?
October 9: Two employees of a cash management firm were shot at by four robbers in Rajguru Nagar. The accused took away a bag containing ₹10 lakh.
October 8: A vehicle theft suspect, Rohit Kubbaa, opened fire at a cop near Dayanand Medical College and Hospital and escaped. The cop survived the gun shot.
October 5: Former panchayat samiti member of the Shiromani Akali Dal (SAD) was shot at by two motorcycle-borne assailants at Lalton Kalan village.
September 10: Three bike-borne men looted ₹4.3 lakh from a biscuit trader in Nirmal Nagar after firing at his brother.
First Published: Oct 11, 2018 21:21 IST
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2018年12月10日星期一
Interstellar technology throws light on spinning black holes
The team responsible for the Oscar nominated visual effects at the centre of Christopher Nolan's epic, Interstellar, have turned science fiction into science fact by providing new insights into the powerful effects of black holes. In a paper published today, 13 February, in IOP Publishing's journal Classical and Quantum Gravity, the team describe the innovative computer code that was used to generate the movie's iconic images of the wormhole, black hole and various celestial objects, and explain how the code has led them to new science discoveries.
Using their code, the Interstellar team, comprising London based visual effects company Double Negative and Caltech theoretical physicist Kip Thorne, found that when a camera is close up to a rapidly spinning black hole, peculiar surfaces in space, known as caustics, create more than a dozen images of individual stars and of the thin, bright plane of the galaxy in which the black hole lives. They found that the images are concentrated along one edge of the black hole's shadow.
These multiple images are caused by the black hole dragging space into a whirling motion and stretching the caustics around itself many times. It is the first time that the effects of caustics have been computed for a camera near a black hole, and the resulting images give some idea of what a person would see if they were orbiting around a hole.
The discoveries were made possible by the team's computer code, which, as the paper describes, mapped the paths of millions of lights beams and their evolving cross sections as they passed through the black hole's warped spacetime. The computer code was used to create images of the movie's wormhole and the black hole, Gargantua, and its glowing accretion disk, with unparalleled smoothness and clarity.
It showed portions of the accretion disk swinging up over the top and down under Gargantua's shadow, and also in front of the shadow's equator, producing an image of a split shadow that has become iconic for the movie.
This weird distortion of the glowing disk was caused by gravitational lensing a process by which light beams from different parts of the disk, or from distant stars, are bent and distorted by the black hole, before they arrive at the movie's simulated camera.
This lensing happens because the black hole creates an extremely strong gravitational field, literally bending the fabric of spacetime around itself, like a bowling ball lying on a stretched out bed sheet.
Early in their work on the movie, with the black hole encircled within a rich field of distant stars and nebulae instead of an accretion disk, the team found that the standard approach of using just one light ray for one pixel in a computer code in this instance, for an IMAX picture, a total of 23 million pixels resulted in flickering as the stars and nebulae moved across the screen. We, too, need smooth images."
Oliver James continued: "Once our code, called DNGR for Double Negative Gravitational Renderer, was mature and creating the images you see in the movie Interstellar, we realised we had a tool that could easily be adapted for scientific research."
In their paper, the team report how they used DNGR to carry out a number of research simulations exploring the influence of caustics peculiar, creased surfaces in space on the images of distant star fields as seen by a camera near a fast spinning black hole.
"A light beam emitted from any point on a caustic surface gets focussed by the black hole into a bright cusp of light at a given point," James continued. "All of the caustics, except one, wrap around the sky many times when the camera is close to the black hole. This sky wrapping is caused by the black hole's spin, dragging space into a whirling motion around itself like the air in a whirling tornado, and stretching the caustics around the black hole many times."
As each caustic passes by a star, it either creates two new images of the star as seen by the camera, or annihilates two old images of the star. As the camera orbits around the black hole, film clips from the DNGR simulations showed that the caustics were constantly creating and annihilating a huge number of stellar images.
The team identified as many as 13 simultaneous images of the same star, and as many as 13 images of the thin, bright plane of the galaxy in which the black hole lives.
These multiple images were only seen when the black hole was spinning rapidly and only near the side of the black hole where the hole's whirling space was moving toward the camera, which they deduced was because the space whirl was 'flinging' the images outward from the hole's shadow edge. On the shadow's opposite side, where space is whirling away from the camera, the team deduced that there were also multiple images of each star, but that the whirl of space compressed them inward, so close to the black hole's shadow that they could not be seen in the simulations.
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