Computers Math

Although grasping objects is a relatively straightforward task for us humans, there is a lot of mechanics involved in this simple task. Picking up an object requires fine control of the fingers, of their positioning, and of the pressure each finger applies, which in turn necessitates intricate sensing capabilities. It’s no wonder that robotic grasping and manipulation is a very active research area within the field of robotics.
Today, industrial robotic hands have replaced humans in various complex and hazardous activities, including in restaurants, farms, factories, and manufacturing plants. In general, soft robotic grippers are better suited for tasks in which the objects to be picked up are fragile, such as fruits and vegetables. However, while soft robots are promising as harvesting tools, they usually share a common disadvantage: their price tag. Most soft robotic gripper designs require the intricate assembly of multiple pieces. This drives up development and maintenance costs.
Fortunately, a research team from the Japan Advanced Institute of Technology (JAIST), led by Associate Professor Van Anh Ho, have come up with a groundbreaking solution to these problems. Taking a leaf from nature, they have developed an innovative soft robotic gripper called ‘ROSE,’ which stands for ‘Rotation-based Squeezing Gripper.’ Details about ROSE’s design, as well as the results of their latest study, have been presented at the Robotics: Science and Systems 2023 (RSS2023) conference.
What makes ROSE so impressive is its design. The soft gripping part has the shape of a cylindrical funnel or sleeve and is connected to a hard circular base, which in turn is attached to the shaft of an actuator. The funnel must be placed over the object meant to be picked up, covering a decent portion of its surface area. Then, the actuator makes the base turn, which causes the flexible funnel’s skin to wrap tightly around the object. This mechanism was loosely inspired by the changing shapes of roses, which bloom during the day and close up during the night.
ROSE offers substantial advantages compared to more conventional grippers. First, it is much less expensive to manufacture. The hard parts can all be 3D-printed, whereas the funnel itself can be easily produced using a mold and liquid silicone rubber. This ensures that the design is easily scalable and is suitable for mass production.
Second, ROSE can easily pick up a wide variety of objects without complex control and sensing mechanisms. Unlike grippers that rely on finger-like structures, ROSE’s sleeve applies a gentler, more uniform pressure. This makes ROSE better suited for handling fragile produce, such as strawberries and pears, as well as slippery objects. Weighing less than 200 grams, the gripper can achieve an impressive payload-to-weight ratio of 6812%.
Third, ROSE is extremely durable and sturdy. The team showed that it could successfully continue to pick up objects even after 400,000 trials. Moreover, the funnel still works properly in the presence of significant cracks or cuts. “The proposed gripper excels in demanding scenarios, as evidenced by its ability to withstand a severe test in which we cut the funnel into four separate sections at full height,” remarks Assoc. Prof. Ho, “This test underscores the gripper’s exceptional resilience and optimal performance in challenging conditions.”
Finally, ROSE can be endowed with sensing capabilities. The researchers achieved this by placing multiple cameras on top of the circular base, pointing at the inside of the funnel, which was covered in markers, whose position could be picked up by the cameras and analyzed through image processing algorithms. This promising approach allows for size and shape estimation of the grasped object.
The research team notes that ROSE could be an enticing option for various applications, including harvesting operations and sorting items in factories. It could also find a home in cluttered environments such as farms, professional kitchens, and warehouses. “The ROSE gripper holds significant potential to revolutionize gripping applications and gain widespread acceptance across various fields,” concludes Assoc. Prof. Ho, “Its straightforward yet robust and dependable design is set to inspire researchers and manufacturers to embrace it for a broad variety of gripping tasks in the near future.” More

What should the city we live in look like? How do structural changes affect the people who move around it? Cartographers at Ruhr University Bochum use virtual reality tools to explore these questions before a great deal of money is spent on building measures. Using the Unity3 game engine, they recreate scenarios in 3D where people can experience potential changes through immersion. They were able to prove that the physical reaction to this experience is measurable. Julian Keil and Marco Weißmann from Professor Frank Dickmann’s team published their findings in KN — Journal of Cartography and Geographic Information on 1 May 2023 and in Applied Sciences on 13 May 2023.
Lab kit for urban scenarios
Construction measures that transform urban settings change the environment of both the people who live there permanently and those who visit them temporarily. It’s not always possible to foresee the effects in advance. In such cases, it helps to recreate the setting in a 3D model which people can experience through immersion. To this end, the cartographers working with Marco Weißmann use software that was originally designed to programme computer game environments. “We’ve developed a lab kit of sorts in which you can simulate an environment virtually, complete with traffic,” explains Weißmann. The researchers can use it to directly visualise the effects of planned structural changes: how does the traffic flow? Do cars and pedestrians get in each other’s way or not?
Measuring the implicit effects of spaces
Moreover, the space that surrounds us affects our well-being. We do notice it sometimes, but not always. “People who’ve lived on a noisy street for a long time, for example, might think they don’t even hear the noise anymore,” says Julian Keil. “But we know that, objectively speaking, residents in such streets experience significantly higher stress levels than others.” In order to determine such implicit effects of urban planning measures before a lot of money has been poured into them, the cartography team developed a method to measure them in advance. For this purpose, they programmed an urban environment in virtual reality and had test participants experience the scenarios. At the same time, they measured the skin conductivity of the test persons, which provides information about their stress level.
They showed that a higher traffic volume in a street clearly upset the test persons, as measured by their skin conductivity. To corroborate their findings, a study is planned to incorporate more physical measurements that will provide information about the participants’ stress levels and various emotions, including heart rate, blood pressure and pupil size. “Until now, residents and other stakeholders have been involved in the planning stage of construction measures, but only in the form of surveys, i.e. explicit statements,” says Keil, whose background is in psychology. “Our method enables spatial planners to assess implicit effects of possible measures and to include them in the planning, too.”
Climate-friendly experiments
The experiments for both studies were conducted in a climate-friendly way using electricity from a mobile solar system on the roof of the institute building. More

A new theoretical study provides a framework for understanding nonlocality, a feature that quantum networks must possess to perform operations inaccessible to standard communications technology. By clarifying the concept, researchers determined the conditions necessary to create systems with strong, quantum correlations.
The study, published in Physical Review Letters, adapts techniques from quantum computing theory to create a new classification scheme for quantum nonlocality. This not only allowed the researchers to unify prior studies of the concept into a common framework, but it facilitated a proof that networked quantum systems can only display nonlocality if they possess a particular set of quantum features.
“On the surface, quantum computing and nonlocality in quantum networks are different things, but our study shows that, in certain ways, they are two sides of the same coin,” said Eric Chitambar, a professor of electrical and computer engineering at the University of Illinois Urbana-Champaign and the project lead. “In particular, they require the same fundamental set of quantum operations to deliver effects that cannot be replicated with classical technology.”
Nonlocality is a consequence of entanglement, in which quantum objects experience strong connections even when separated over vast physical distances. When entangled objects are used to perform quantum operations, the results display statistical correlations that cannot be explained by non-quantum means. Such correlations are said to be nonlocal. A quantum network must possess a degree of nonlocality to ensure that it can perform truly quantum functions, but the phenomenon is still poorly understood.
To facilitate study of nonlocality, Chitambar and physics graduate student Amanda Gatto Lamas applied the formalism of quantum resource theory. By treating nonlocality as a “resource” to manage, the researchers’ framework allowed them to view past studies of nonlocality as separate instances of the same concept, just with different restrictions on the resource’s availability. This facilitated the proof of their main result, that nonlocality can only be achieved with a limited set of quantum operations.
“Our result is the quantum network analogue to an important quantum computing result called the Gottesman-Knill theorem,” Gatto Lamas explained. “While Gottesman-Knill clearly defines what a quantum computer must do to surpass a classical one, we show that a quantum network must be constructed with a particular set of operations to do things that a standard communications network cannot.”
Chitambar believes that the framework will not only be useful for developing criteria to assess a quantum network’s quality based on the degree of nonlocality it possesses, but that it can be used to expand the concept of nonlocality.
“Right now, there is a relatively good understanding of the type of nonlocality that can emerge between two parties,” he said. “However, one can imagine for a quantum network consisting of many connected parties that there might be some kind of global property that you can’t reduce to individual pairs on the network. Such a property might depend intimately on the network’s overall structure.” More

A team of researchers has developed new LEDs which emit light simultaneously in two different wavelength ranges, for a simpler and more comprehensive way to monitor the freshness of fruit and vegetables. As the team write in the journal Angewandte Chemie, modifying the LEDs with perovskite materials causes them to emit in both the near-infrared range and the visible range, a significant development in the contact-free monitoring of food.
Perovskite crystals are able to capture and convert light. Being simple to produce and highly efficient, perovskites are already used in solar cells but are also being intensively researched for suitability in other technologies. Angshuman Nag and his team at the Indian Institute of Science Education and Research (IISER) in Pune, India, are now proposing a perovskite application in LED technology that could simplify the quality control of fresh fruit and vegetables.
Without light converters, LEDs would emit light in rather narrow light bands. To cover the whole range of white light produced by the sun, the diodes in “phosphor-converted” (pc) LEDs are coated with luminescent substances. Nag and his team have used a double emission coating with the purpose to produce pc-LEDs that emit both white (“normal”) light and also a strong band in the near-infrared range (NIR).
To make the dual-emission pc-LED, they applied a double perovskite doped with bismuth and chromium. Part of the bismuth component emits warm white light and another part transfers energy to the chromium component, de-exciting it and causing an additional emission in the NIR range, the researchers found out.
NIR is already used in the food industry to examine freshness in fruit and vegetables. Nag and PhD student Sajid Saikia, first author of the paper, explain their idea: “Food contains water, which absorbs the broad near-infrared emission at around 1000 nm. The more water that is present [due to rotting], the greater the absorption of near-infrared radiation, yielding darker contrast in an image taken under near-infrared radiation. This easy, non-invasive imaging process can estimate the water content in different parts of food, assessing its freshness.”
Using these modified pc-LEDs to examine apples or strawberries, the team observed dark spots that were not visible in standard camera images. Illuminating the food with both white and NIR light revealed normal coloring that could be seen by the naked eye, as well as those parts which were starting to rot, but not yet visibly so.
Saikia and Nag envision a compact device for simultaneous visual and NIR food inspection, although the two detectors, one for visible light and one for NIR light, could make such an instrument costly for common applications. On the other hand, the researchers emphasize that the pc LEDs are easy to produce without any chemical waste or solvents and short-term costs could be more than recovered by the long service life and scalability of this novel dual-emitting pc-LED device. More

A team of scientists has devised a system that replicates the movement of naturally occurring phenomena, such as hurricanes and algae, using laser beams and the spinning of microscopic rotors.
The breakthrough, reported in the journal Nature Communications, reveals new ways that living matter can be reproduced on a cellular scale.
“Living organisms are made of materials that actively pump energy through their molecules, which produce a range of movements on a larger cellular scale,” explains Matan Yah Ben Zion, a doctoral student in New York University’s Department of Physics at the time of the work and one of the paper’s authors. “By engineering cellular-scale machines from the ground up, our work can offer new insights into the complexity of the natural world.”
The research centers on vortical flows, which appear in both biological and meteorological systems, such as algae or hurricanes. Specifically, particles move into orbital motion in the flow generated by their own rotation, resulting in a range of complex interactions.
To better understand these dynamics, the paper’s authors, who also included Alvin Modin, an NYU undergraduate at the time of the study and now a doctoral student at Johns Hopkins University, and Paul Chaikin, an NYU physics professor, sought to replicate them at their most basic level. To do so, they created tiny micro-rotors — about 1/10th the width of a strand of human hair — to move micro-particles using a laser beam (Chaikin and his colleagues devised this process in a previous work).
The researchers found that the rotating particles mutually affected each other into orbital motion, with striking similarities to dynamics observed by other scientists in “dancing” algae — algae groupings that move in concert with each other.
In addition, the NYU team found that the spins of the particles reciprocate as the particles orbit.
“The spins of the synthetic particles reciprocate in the same fashion as that observed in algae — in contrast to previous work with artificial micro-rotors,” explains Ben Zion, now a researcher at Tel Aviv University. “So we were able to reproduce synthetically — and on the micron scale — an effect that is seen in living systems.”
“Collectively, these findings suggest that the dance of algae can be reproduced in a synthetic system, better establishing our understanding of living matter,” he adds.
The research was supported by grants from the Department of Energy (DE-SC0007991, SC0020976). More

Artificial intelligence (AI) is all the rage lately in the public eye. How AI is being incorporated to the advantage of our everyday life despite its rapid development, however, remains an elusive topic that deserves the attention of many scientists. While in theory AI can replace, or even displace, human beings from their positions, the challenge remains on how different industries and institutions can take advantage of this technological advancement and not drown in it.
Recently, a team of researchers at the Hong Kong University of Science and Technology (HKUST) conducted an ambitious study of AI applications on the education front, examining how AI could enhance grading while observing human participants’ behavior in the presence of a computerized companion. They found that teachers were generally receptive to AI’s input — until both sides came to an argument on who should reign supreme. This very much resembles how human beings interact with one another when a new member forays into existing territory.
The research was conducted by HKUST Department of Computer Science and Engineering Ph.D. candidate Chengbo Zheng and four of his teammates under the supervision of Associate Professor Prof. Xiaojuan MA. They developed an AI group member named AESER (Automated Essay ScorER) and separated twenty English teachers into ten groups to investigate the impact of AESER in a group discussion setting, where the AI would contribute in opinion deliberation, asking and answering questions and even voting for the final decision. In this study, designed akin to the controlled “Wizard of Oz” research method, a deep learning model and a human researcher would form joint input to AESER, which would then exchange views and conduct discussions with other participants in an online meeting room.
While the team expected AESER to promote objectivity and provide novel perspectives that would otherwise be overlooked, potential challenges were soon revealed. First, there was the risk of conformity, where the engagement of AI would soon create a majority to thwart discussions. Second, views provided by AESER were found to be rigid and even stubborn, which frustrated the participants when they found that an argument could never be “won.” Many also did not think AI’s input should be given equal weight and are more fit to play the role of an assistant to actual human work.
“At this stage, AI is deemed somewhat ‘stubborn’ by human collaborators, for good and bad,” noted Prof Ma. “On the one hand, AI is stubborn so it does not fear to express its opinions frankly and openly. However, human collaborators feel disengaged when they could not meaningfully persuade AI to change its view. Humans varying attitudes towards AI. Some consider it to be a single intelligent entity while others regard AI as the voice of collective intelligence that emerges from big data. Discussions about issues such as authority and bias thus arise.”
The immediate next step for the team involves expanding its scope to gathermore quantitative data, which will provide more measurable and precise insights into how AI impacts group decision-making. They are also looking to explore large language models (LLMs) such as ChatGPT into the study, which could potentially bring new insights and perspectives to group discussions. More

A University of Minnesota Twin Cities team has, for the first time, synthesized a thin film of a unique topological semimetal material that has the potential to generate more computing power and memory storage while using significantly less energy. The researchers were also able to closely study the material, leading to some important findings about the physics behind its unique properties.
The study is published in Nature Communications, a peer-reviewed scientific journal that covers the natural sciences and engineering.
As evidenced by the United States’ recent CHIPS and Science Act, there is a growing need to increase semiconductor manufacturing and support research that goes into developing the materials that power electronic devices everywhere. While traditional semiconductors are the technology behind most of today’s computer chips, scientists and engineers are always looking for new materials that can generate more power with less energy to make electronics better, smaller, and more efficient.
One such candidate for these new and improved computer chips is a class of quantum materials called topological semimetals. The electrons in these materials behave in different ways, giving the materials unique properties that typical insulators and metals used in electronic devices do not have. For this reason, they are being explored for use in spintronic devices, an alternative to traditional semiconductor devices that leverage the spin of electrons rather than the electrical charge to store data and process information.
In this new study, an interdisciplinary team of University of Minnesota researchers were able to successfully synthesize such a material as a thin film — and prove that it has the potential for high performance with low energy consumption.
“This research shows for the first time that you can transition from a weak topological insulator to a topological semimetal using a magnetic doping strategy,” said Jian-Ping Wang, a senior author of the paper and a Distinguished McKnight University Professor and Robert F. Hartmann Chair in the University of Minnesota Department of Electrical and Computer Engineering. “We’re looking for ways to extend the lifetimes for our electrical devices and at the same time lower the energy consumption, and we’re trying to do that in non-traditional, out-of-the-box ways.”
Researchers have been working on topological materials for years, but the University of Minnesota team is the first to use a patented, industry-compatible sputtering process to create this semimetal in a thin film format. Because their process is industry compatible, Wang said, the technology can be more easily adopted and used for manufacturing real-world devices.

“Every day in our lives, we use electronic devices, from our cell phones to dishwashers to microwaves. They all use chips. Everything consumes energy,” said Andre Mkhoyan, a senior author of the paper and Ray D. and Mary T. Johnson Chair and Professor in the University of Minnesota Department of Chemical Engineering and Materials Science. “The question is, how do we minimize that energy consumption? This research is a step in that direction. We are coming up with a new class of materials with similar or often better performance, but using much less energy.”
Because the researchers fabricated such a high-quality material, they were also able to closely analyze its properties and what makes it so unique.
“One of the main contributions of this work from a physics point of view is that we were able to study some of this material’s most fundamental properties,” said Tony Low, a senior author of the paper and the Paul Palmberg Associate Professor in the University of Minnesota Department of Electrical and Computer Engineering. “Normally, when you apply a magnetic field, the longitudinal resistance of a material will increase, but in this particular topological material, we have predicted that it would decrease. We were able to corroborate our theory to the measured transport data and confirm that there is indeed a negative resistance.”
Low, Mkhoyan, and Wang have been working together for more than a decade on topological materials for next generation electronic devices and systems — this research wouldn’t have been possible without combining their respective expertise in theory and computation, material growth and characterization, and device fabrication.
“It not only takes an inspiring vision but also great patience across the four disciplines and a dedicated group of team members to work on such an important but challenging topic, which will potentially enable the transition of the technology from lab to industry,” Wang said.
In addition to Low, Mkhoyan, and Wang, the research team included University of Minnesota Department of Electrical and Computer Engineering researchers Delin Zhang, Wei Jiang, Onri Benally, Zach Cresswell, Yihong Fan, Yang Lv, and Przemyslaw Swatek; Department of Chemical Engineering and Materials Science researcher Hwanhui Yun; Department of Physics and Astronomy researcher Thomas Peterson; and University of Minnesota Characterization Facility researchers Guichuan Yu and Javier Barriocanal.
This research is supported by SMART, one of seven centers of nCORE, a Semiconductor Research Corporation program, sponsored by National Institute of Standards and Technology (NIST). T.P. and D.Z. were partly supported by ASCENT, one of six centers of JUMP, a Semiconductor Research Corporation program that is sponsored by MARCO and DARPA. This work was partially supported by the University of Minnesota’s Materials Research Science and Engineering Center (MRSEC) program under award number DMR-2011401 (Seed). Parts of this work were carried out in the Characterization Facility of the University of Minnesota Twin Cities, which receives partial support from the National Science Foundation through the MRSEC (Award NumberDMR-2011401). Portions of this work were conducted in the Minnesota Nano Center, which is supported by the NSF Nano Coordinated Infrastructure Network (NNCI) under Award Number ECCS-2025124. More

The future of electronics will be based on novel kinds of materials. Sometimes, however, the naturally occurring topology of atoms makes it difficult for new physical effects to be created. To tackle this problem, researchers at the University of Zurich have now successfully designed superconductors one atom at a time, creating new states of matter.
What will the computer of the future look like? How will it work? The search for answers to these questions is a major driver of basic physical research. There are several possible scenarios, ranging from the further development of classical electronics to neuromorphic computing and quantum computers. The common element in all these approaches is that they are based on novel physical effects, some of which have so far only been predicted in theory. Researchers go to great lengths and use state-of-the-art equipment in their quest for new quantum materials that will enable them to create such effects. But what if there are no suitable materials that occur naturally?
Novel approach to superconductivity
In a recent study published in Nature Physics, the research group of UZH Professor Titus Neupert, working closely together with physicists at the Max Planck Institute of Microstructure Physics in Halle (Germany), presented a possible solution. The researchers made the required materials themselves — one atom at a time. They are focusing on novel types of superconductors, which are particularly interesting because they offer zero electrical resistance at low temperatures. Sometimes referred to as “ideal diamagnets,” superconductors are used in many quantum computers due to their extraordinary interactions with magnetic fields. Theoretical physicists have spent years researching and predicting various superconducting states. “However, only a small number have so far been conclusively demonstrated in materials,” says Professor Neupert.
Two new types of superconductivity
In their exciting collaboration, the UZH researchers predicted in theory how the atoms should be arranged to create a new superconductive phase, and the team in Germany then conducted experiments to implement the relevant topology. Using a scanning tunneling microscope, they moved and deposited the atoms in the right place with atomic precision. The same method was also used to measure the system’s magnetic and superconductive properties. By depositing chromium atoms on the surface of superconducting niobium, the researchers were able to create two new types of superconductivity. Similar methods had previously been used to manipulate metal atoms and molecules, but until now it has never been possible to make two-dimensional superconductors with this approach.
The results not only confirm the physicists’ theoretical predictions, but also give them reason to speculate about what other new states of matter might be created in this way, and how they could be used in the quantum computers of the future. More