Latest news with #ShanghaiJiaoTongUniversity
The Star
3 days ago
- Science
- The Star
China's new tech for quieter subs could revolutionise underwater stealth: study
A research team in Shanghai has unveiled a vibration-damping technology that could significantly improve the stealth of submarines during covert operations, according to a peer-reviewed study published in the Chinese journal Noise and Vibration Control. Zhang Zhiyi and his team of researchers, from Shanghai Jiao Tong University's State Key Laboratory of Mechanical Systems and Vibration, said their innovation could theoretically cut the detection range of hostile sonar systems by more than half. The technology is intended to replace traditional rigid engine mounts with a hybrid active-passive vibration isolation system that would reduce the engine noise transmitted through submarine hulls by up to 26 decibels (dB), according to the paper. It combined a steel-rubber-steel 'sandwich' ring to dissipate vibrations, and an active layer with 12 piezoelectric actuators arranged radially around the engine to further reduce the noise, it said. These electrically-powered actuators can neutralise the engine's micron-level movements with strong control forces through precision lever mechanisms. 'Research indicates that a mere 10dB reduction in underwater vehicle noise can decrease its detectable range by 32 per cent,' according to the paper, published in April. 'During low-speed navigation, mechanical noise generated by power equipment operation constitutes the primary noise source for underwater vehicles, serving as their key acoustic signature for detection – typically manifested as a series of low-frequency tonal components,' the researchers said. 'Implementing vibration damping measures to diminish energy transmission from engines through supporting structures is crucial for enhancing underwater vehicles' acoustic stealth performance.' Zhang and his team conducted laboratory tests on a scaled-down prototype that showed unprecedented performance with 24dB reduction (12dB passive plus 12dB active) at 100 Hz, and 26dB at 400Hz. Effective bandwidth went across 10–500Hz, covering most typical engine harmonics, while real-time noise cancellation was possible thanks to the system's extremely short response time, according to the study. The researchers said the system's smart FX-LMS adaptive algorithm used a multidimensional control matrix to coordinate all 12 actuators, avoiding destabilising feedback loops – a major challenge in real life applications. While the lab results are striking, hurdles remain. Rubber stiffness, for instance, shifts under changing temperature and pressures, and it is unknown how durable the piezoelectric materials will prove to be in long-term operations. It is unclear what type of engine noise reduction is used in Chinese submarines, and the the researchers did not specify the overall improvement on a sub's noise profile that would be achieved by the new technology. China State Shipbuilding Corporation, a major submarine builder, contributed to the study. - South China Morning Post
Yahoo
4 days ago
- General
- Yahoo
Astrophysicists Discovered Strange New Objects in Our Galaxy ‘Unlike Anything Else'
Here's what you'll learn when you read this story: The Central Molecular Zone, spanning 700 light-years across the heart of the galaxy, contains a majority of the dense gas in the Milky Way. While analyzing this region with the Atacama Large Millimeter/submillimeter Array (ALMA), an international team of scientists discovered a slew of strange "slim filaments" unassociated with star-forming regions. The filaments are likely part of what the researchers call "space tornadoes," which distributes material throughout the CMZ efficiently. It's been little more than half a century since scientists first proposed that a supermassive black hole lies at the heart of the Milky Way. And in the decades since, we've discovered a remarkable amount about our particular corner of the universe—but there's always more to learn. One area that remains a particular mystery is the Central Molecular Zone, or CMZ, which stretches some 700 light-years across at the heart of the galaxy. This region contains roughly 80 percent of all dense gas in the Milky Way, which—according to the Harvard & Smithsonian Center for Astrophysics—accounts for about tens of millions of solar masses of material. Home to giant molecular clouds and numerous star-forming clusters, the CMZ is a swirling mystery, and there is no other place in the galaxy like it. Now, a new study—led by a team of astrophysicists drawing upon data from the Atacama Large Millimeter/submillimeter Array (ALMA) in Chile—is adding another curiosity to this already head-scratching region of the galaxy: unexpected 'slim filaments' that have left astronomers guessing at their origin. Details of this surprising discovery were published in the journal Astronomy & Astrophysics. An array of 66 radio telescopes located under the remarkably clear skies of the Chajnantor Plateau in the Atacama Desert, ALMA (as its name suggests) is particularly well suited to examining the CMZ thanks to its high angular resolution and its ability to trace certain molecules found in abundance in this region of space. Among those molecules is silicon oxide (SiO), which serves as a tracer for shockwaves in the CMZ. By tracing the spectral lines of SiO, astronomers can better understand this chaotic environment—and, as it turns out, discover previously unknown filament structures. 'SiO is currently the only molecule that exclusively traces shocks, and the SiO 5-4 rotational transition is only detectable in shocked regions that have both relatively high densities and high temperatures,' Kai Yang, lead author of the study from Shanghai Jiao Tong University, said in a press statement. 'This makes it a particularly valuable tool for tracing shock-induced processes in the dense regions of the CMZ. When we checked the ALMA images showing the outflows, we noticed these long and narrow filaments spatially offset from any star-forming regions. Unlike any objects we know, these filaments really surprised us. Since then, we have been pondering what they are.' Using the SiO emission lines (along with those of eight other molecules), the astronomers confirmed that their velocities were inconsistent with outflows, show no association with dust emission, and are in hydrostatic equilibrium—a delicate balance between gravity and pressure. All these anomalous findings, packaged alongside insights like 'unlike any objects we know, ' inspire fantasies of massive alien structures hiding out in the heart of our galaxy. But the astronomers have a more science-based explanation, and it is no less mesmerizing. 'We can envision these as space tornados: they are violent streams of gas, they dissipate shortly, and they distribute materials into the environment efficiently,' Xing Lu, a co-author of the study from Shanghai Astronomical Observatory, said in a press statement. 'Our research contributes to the fascinating Galactic Center landscape by uncovering these slim filaments as an important part of material circulation.' The authors theorize that these filaments may be part of a depletion-replenishment cycle at the heart of our galaxy. First, shock waves create these filaments. Then, as these filaments dissipate, they 'refuel' shock-released material in the CMZ and freeze back into dust grains. As scientists delve deeper into the mysteries of these filaments—and if they're as widespread as this particular ALMA sample would suggest—then we may have uncovered an important cyclic process that lies at the heart of our galaxy. You Might Also Like The Do's and Don'ts of Using Painter's Tape The Best Portable BBQ Grills for Cooking Anywhere Can a Smart Watch Prolong Your Life?
South China Morning Post
6 days ago
- Science
- South China Morning Post
China's super-quiet submarine tech halves engine noise detection range: study
A research team in Shanghai has unveiled a vibration-damping technology that could significantly improve the stealth of submarines during covert operations, according to a peer-reviewed study published in the Chinese journal Noise and Vibration Control. Zhang Zhiyi and his team of researchers, from Shanghai Jiao Tong University's State Key Laboratory of Mechanical Systems and Vibration, said their innovation could theoretically cut the detection range of hostile sonar systems by more than half. The technology is intended to replace traditional rigid engine mounts with a hybrid active-passive vibration isolation system that would reduce the engine noise transmitted through submarine hulls by up to 26 decibels (dB), according to the paper. It combined a steel-rubber-steel 'sandwich' ring to dissipate vibrations, and an active layer with 12 piezoelectric actuators arranged radially around the engine to further reduce the noise, it said. These electrically-powered actuators can neutralise the engine's micron-level movements with strong control forces through precision lever mechanisms. 'Research indicates that a mere 10dB reduction in underwater vehicle noise can decrease its detectable range by 32 per cent,' according to the paper, published in April. 'During low-speed navigation, mechanical noise generated by power equipment operation constitutes the primary noise source for underwater vehicles, serving as their key acoustic signature for detection – typically manifested as a series of low-frequency tonal components,' the researchers said.
Business Upturn
26-05-2025
- Science
- Business Upturn
ASC25 Student Supercomputer Challenge: Shanghai Jiao Tong University Crowned Champion; Peking University Earns Silver
Beijing, China: The finals of the ASC Student Supercomputer Challenge (ASC25) successfully concluded at Qinghai University in Xining, China. Following five days of rigorous competition, the team from Shanghai Jiao Tong University emerged as the champion, while the team from Peking University secured the silver prize, both demonstrating outstanding competence in high-performance computing and scientific problem-solving. More than 300 university teams from around the world registered for ASC25. Following a preliminary selection round, 25 teams advanced to the finals held at Qinghai University—marking the geographically highest-altitude venue in the history of the ASC competition. In the final round, participating teams were required to design and deploy small-scale supercomputing clusters, each constrained by a 4,000-watt power consumption limit. Within these clusters, teams executed and optimized internationally recognized benchmark tests, HPL and HPCG. Additionally, they applied performance optimization strategies to a suite of advanced scientific and engineering applications, including acceleration for AlphaFold3 inference and RNA 5-methylcytosine modification site detection, as well as DeepSeek inference and cosmic neutrino detection simulations. Teams were further assessed through English-language oral defenses presented before a jury composed of more than ten internationally renowned experts in high-performance computing and scientific applications. Furthermore, the 25 finalist teams were randomly assigned into five groups for the Group Competition, where they collaborated across institutions to address a complex scientific challenge: numerical simulation of the Qinghai-Tibet Plateau climate. As anticipated, the final round of the competition was marked by exceptional intensity and high-level performance. The 25 finalist teams demonstrated excellence across a range of evaluation criteria, including system architecture design, power efficiency, application performance optimization, collaborative problem-solving, and oral defense presentations. Their collective pursuit of innovation and technical advancement contributed to a truly remarkable and impactful event. The team from Shanghai Jiao Tong University demonstrated comprehensive capabilities, delivering strong performances in multiple tasks such as AlphaFold3 inference optimization, DeepSeek inference, and cosmic neutrino detection simulation. Their results reflected a deep understanding of artificial intelligence, high-performance computing systems, and interdisciplinary scientific applications, as well as superior optimization skills—culminating in their attainment of the overall championship. Meanwhile, the team from Peking University delivered outstanding results in RNA 5-methylcytosine modification site detection and DeepSeek optimization, earning them the silver prize. In the designated task for the e Prize Challenge—AlphaFold3 inference optimization—the team from Shanghai Jiao Tong University implemented comprehensive system-level and algorithmic optimizations. These included framework migration, refinement of matrix algorithms, task decomposition, parallel computing strategies, and communication acceleration. As a result of these efforts, they successfully achieved efficient multi-node inference of AlphaFold3 on a general-purpose CPU-based cluster. Their outstanding performance secured the highest ranking in this challenge and earned them the prestigious e Prize. A group comprising students from Sun Yat-sen University, Peking University, Beijing Normal University, Fuzhou University, and National Taiwan University demonstrated exceptional coordination and exemplary inter-institutional collaboration. Their joint efforts resulted in the highest score in the Qinghai-Tibet Plateau climate simulation challenge. In recognition of their outstanding performance, the team was collectively awarded the Group Competition Award. Teams from Zhejiang University, Fuzhou University, and Qilu University of Technology were awarded the Application Innovation Award in recognition of their outstanding performance in specific competition challenges and their innovative approaches to application-level problem-solving. Jack Dongarra, Chair of ASC Advisory Committee, Turing Award winner, and Emeritus Professor at the University of Tennessee, stated: 'The ASC Student Supercomputer Challenge is not just a competition, but a platform connecting global students, mentors, and industry leaders—where knowledge, creativity, and cutting-edge technologies ignite new possibilities. The fascination with emerging technologies, the fearless courage to tackle complex challenges, and the spirit of cross-border collaboration demonstrated by young participants all fuel students' drive to explore, innovate, and ultimately achieve personal breakthroughs.' Shi Yuanchun, President of Qinghai University, stated: 'The competition is a premier platform for young students around the world to push the boundaries of computing and explore the frontiers of science and technology. It also serves as a bridge for mutual learning among civilizations. By hosting the ASC25 finals, Qinghai University has delivered a powerful message to the world—vibrant, rigorous, pragmatic, and driven toward progress. Looking ahead, Qinghai University will collaborate with global partners to address major scientific challenges, drive breakthroughs in cutting-edge supercomputing technologies, and unleash innovative momentum on the Qinghai-Tibet Plateau.' View the ASC25 Video here About ASC The ASC Student Supercomputer Challenge serves as a platform to promote the exchange and development of young talent in supercomputing worldwide, with support from experts and institutions across Asia, Europe, and America. The competition aims to elevate the application and R&D capabilities in supercomputing, harness its technological driving force, and foster innovation across science, technology, and industry. Since its inception in 2012, ASC has attracted tens of thousands of university students from six continents, solidifying its status as the largest university-level supercomputing competition globally. To discover more about this impactful endeavor, visit the website View source version on Disclaimer: The above press release comes to you under an arrangement with Business Wire. Business Upturn takes no editorial responsibility for the same.
Associated Press
26-05-2025
- Science
- Associated Press
ASC25 Student Supercomputer Challenge: Shanghai Jiao Tong University Crowned Champion; Peking University Earns Silver
BEIJING--(BUSINESS WIRE)--May 25, 2025-- The finals of the ASC Student Supercomputer Challenge (ASC25) successfully concluded at Qinghai University in Xining, China. Following five days of rigorous competition, the team from Shanghai Jiao Tong University emerged as the champion, while the team from Peking University secured the silver prize, both demonstrating outstanding competence in high-performance computing and scientific problem-solving. More than 300 university teams from around the world registered for ASC25. Following a preliminary selection round, 25 teams advanced to the finals held at Qinghai University—marking the geographically highest-altitude venue in the history of the ASC competition. In the final round, participating teams were required to design and deploy small-scale supercomputing clusters, each constrained by a 4,000-watt power consumption limit. Within these clusters, teams executed and optimized internationally recognized benchmark tests, HPL and HPCG. Additionally, they applied performance optimization strategies to a suite of advanced scientific and engineering applications, including acceleration for AlphaFold3 inference and RNA 5-methylcytosine modification site detection, as well as DeepSeek inference and cosmic neutrino detection simulations. Teams were further assessed through English-language oral defenses presented before a jury composed of more than ten internationally renowned experts in high-performance computing and scientific applications. Furthermore, the 25 finalist teams were randomly assigned into five groups for the Group Competition, where they collaborated across institutions to address a complex scientific challenge: numerical simulation of the Qinghai-Tibet Plateau climate. As anticipated, the final round of the competition was marked by exceptional intensity and high-level performance. The 25 finalist teams demonstrated excellence across a range of evaluation criteria, including system architecture design, power efficiency, application performance optimization, collaborative problem-solving, and oral defense presentations. Their collective pursuit of innovation and technical advancement contributed to a truly remarkable and impactful event. The team from Shanghai Jiao Tong University demonstrated comprehensive capabilities, delivering strong performances in multiple tasks such as AlphaFold3 inference optimization, DeepSeek inference, and cosmic neutrino detection simulation. Their results reflected a deep understanding of artificial intelligence, high-performance computing systems, and interdisciplinary scientific applications, as well as superior optimization skills—culminating in their attainment of the overall championship. Meanwhile, the team from Peking University delivered outstanding results in RNA 5-methylcytosine modification site detection and DeepSeek optimization, earning them the silver prize. In the designated task for the e Prize Challenge—AlphaFold3 inference optimization—the team from Shanghai Jiao Tong University implemented comprehensive system-level and algorithmic optimizations. These included framework migration, refinement of matrix algorithms, task decomposition, parallel computing strategies, and communication acceleration. As a result of these efforts, they successfully achieved efficient multi-node inference of AlphaFold3 on a general-purpose CPU-based cluster. Their outstanding performance secured the highest ranking in this challenge and earned them the prestigious e Prize. A group comprising students from Sun Yat-sen University, Peking University, Beijing Normal University, Fuzhou University, and National Taiwan University demonstrated exceptional coordination and exemplary inter-institutional collaboration. Their joint efforts resulted in the highest score in the Qinghai-Tibet Plateau climate simulation challenge. In recognition of their outstanding performance, the team was collectively awarded the Group Competition Award. Teams from Zhejiang University, Fuzhou University, and Qilu University of Technology were awarded the Application Innovation Award in recognition of their outstanding performance in specific competition challenges and their innovative approaches to application-level problem-solving. Jack Dongarra, Chair of ASC Advisory Committee, Turing Award winner, and Emeritus Professor at the University of Tennessee, stated: 'The ASC Student Supercomputer Challenge is not just a competition, but a platform connecting global students, mentors, and industry leaders—where knowledge, creativity, and cutting-edge technologies ignite new possibilities. The fascination with emerging technologies, the fearless courage to tackle complex challenges, and the spirit of cross-border collaboration demonstrated by young participants all fuel students' drive to explore, innovate, and ultimately achieve personal breakthroughs.' Shi Yuanchun, President of Qinghai University, stated: 'The competition is a premier platform for young students around the world to push the boundaries of computing and explore the frontiers of science and technology. It also serves as a bridge for mutual learning among civilizations. By hosting the ASC25 finals, Qinghai University has delivered a powerful message to the world—vibrant, rigorous, pragmatic, and driven toward progress. Looking ahead, Qinghai University will collaborate with global partners to address major scientific challenges, drive breakthroughs in cutting-edge supercomputing technologies, and unleash innovative momentum on the Qinghai-Tibet Plateau.' View the ASC25 Video here About ASC The ASC Student Supercomputer Challenge serves as a platform to promote the exchange and development of young talent in supercomputing worldwide, with support from experts and institutions across Asia, Europe, and America. The competition aims to elevate the application and R&D capabilities in supercomputing, harness its technological driving force, and foster innovation across science, technology, and industry. Since its inception in 2012, ASC has attracted tens of thousands of university students from six continents, solidifying its status as the largest university-level supercomputing competition globally. To discover more about this impactful endeavor, visit the website View source version on CONTACT: Media contact [email protected] KEYWORD: CHINA ASIA PACIFIC INDUSTRY KEYWORD: TECHNOLOGY ENGINEERING OTHER TECHNOLOGY SOFTWARE MANUFACTURING HARDWARE UNIVERSITY SCIENCE EDUCATION OTHER SCIENCE SOURCE: ASC Student Supercomputer Challenge Copyright Business Wire 2025. PUB: 05/25/2025 09:03 PM/DISC: 05/25/2025 09:02 PM
