Elena V Shevchenko

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This research focused on improving a type of small metal catalysts made of platinum (Pt) to make chemical processes more efficient, specifically for turning a compound called citral into geraniol. They found that using a new type of material, transition metal oleates, to coat the platinum catalysts led to a 90% conversion rate and over 93% selectivity for the desired product. This is important because it helps in creating more efficient manufacturing processes that produce fewer waste products and require less energy. Who this helps: This benefits chemical manufacturers and industries that rely on efficient catalyst use to produce various products.

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This study looked at how iron changes form and behaves in soils from higher ground down to shorelines in freshwater and coastal areas like Lake Erie and Chesapeake Bay. Researchers found that the type of iron present is mostly influenced by how much water is present in the soil, with simple forms like Goethite making up between 9% to 35% in drier areas, while wetter areas showed much higher sulfur interaction, with sulfide levels reaching up to 221 micromoles. Understanding these iron transformations is important because they impact the overall health of coastal ecosystems and how they exchange nutrients with surrounding environments. Who this helps: This helps scientists and environmental managers understand coastal ecosystem health and nutrient cycling.

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This study looked at how the chemical makeup of peat, a type of wetland soil, changes as you dig deeper into it in a specific area of Siberia. They found that deeper layers of peat are better at holding onto carbon, while the top layers are more vulnerable to breaking down due to climate change. This is important because it helps us understand how these peatlands affect carbon levels in the atmosphere, highlighting the need to protect them to reduce carbon emissions. Who this helps: This helps environmental scientists and policymakers working on climate change solutions.

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This study looked at how well and safely Revelise (alteplase), a medication for treating ischemic stroke (IS), works in real-life situations. It involved 2,202 patients, mostly around 68 years old, and found that nearly half (49.9%) of them had good outcomes when discharged, rising to 66.4% after 90 days. The results showed that Revelise effectively reduces stroke-related disabilities, even in older patients and those with other health issues. Who this helps: This benefits patients who suffer from ischemic strokes and the doctors treating them.

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This study looked at a new type of electrode for lithium-oxygen batteries that doesn't require a binding agent, which is often a source of problems as batteries age. The researchers found that by using a special network of carbon nanotubes, these electrodes can perform well repeatedly, showing no major loss of power even after being used a second time. This is important because it could lead to batteries that last longer and are easier to recycle, making energy storage greener and more cost-effective. Who this helps: Patients who rely on longer-lasting battery technology, such as those using medical devices.

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This study focused on creating a special type of self-cleaning coating made from titanium dioxide (TiO) that has a lot of tiny pores. Researchers used a method that involved infiltrating a polymer template, which resulted in a coating capable of degrading about 92% of a dye called methylene blue after being exposed to UV light for three hours. This development is significant because it offers a new way to make highly effective, self-cleaning surfaces that could be used in various applications like solar panels and mirrors. Who this helps: This helps manufacturers and industries that rely on efficient, self-cleaning materials.

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This study looked at how special tiny structures made from copper and selenium behave under high pressure. Researchers found a new form of these materials that appears when pressure reaches over 4 gigapascals, which was not seen before. Importantly, the original structure of the material did not change how stable this new form is when pressure is applied. This discovery is important because it could lead to new materials used in technology. Who this helps: This helps researchers and engineers working on new materials and technologies.

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This study looked at a special mixture of indium and silver (In-Ag alloy) that was confined in a tiny space within porous glass to understand how its magnetic properties change. The researchers found that this alloy exhibits two distinct temperatures where it becomes superconducting (4.05 K and 3.38 K), meaning it can conduct electricity without resistance. Notably, they observed that magnetic behaviors appeared alongside superconductivity, which had not been seen before in this type of alloy. Who this helps: This research helps scientists and engineers working on advanced materials and technologies, particularly in electronics and quantum computing.

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The study looked at how a special mixture of gallium and tin behaves when it's placed in tiny spaces, which can affect its ability to conduct electricity without resistance, known as superconductivity. Researchers discovered that this mixture shows two unique superconducting behaviors when tested in these small areas, meaning its properties change compared to the same mixture in larger forms. This research is important because understanding these changes can lead to better cooling methods in electronic devices. Who this helps: This helps engineers and scientists working on advanced electronic technologies.

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This study looked at ways to significantly reduce friction between metal surfaces using a special combination of materials. Researchers found that a mixture of titanium carbide and molybdenum disulfide applied to rough steel surfaces achieved extremely low friction levels, with the best results showing friction at less than 0.001 under heavy pressure and speed. This discovery is important because it could improve the efficiency and lifespan of machinery in industries where metal parts interact frequently. Who this helps: This helps engineers and manufacturers improve machinery performance and reduce wear on metal components.

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The study looked at the impact of screening for cerebral aneurysms, which can cause dangerous bleeding in the brain, particularly in people with risk factors. It found that screening could reduce the occurrence of these bleeding events by 14.3% across the general population and by 37.5% among close relatives of those affected. This approach could save the Russian economy about 7.7 billion rubles each year and lead to fewer people being severely disabled as a result of aneurysms. Who this helps: This helps patients with cerebral aneurysms and their families, as well as healthcare providers.

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This study examined how thin layers of a material called CsPbBr nanoplatelets interact with light based on their thickness. Researchers found that as the nanoplatelets became thicker, their ability to absorb and emit light in a specific direction, known as optical anisotropy, decreased; for instance, the anisotropy decreased significantly from 2 to 5 layers. This matters because the strong light-emitting properties of the thinnest nanoplatelets could make them useful for improving the efficiency of devices like LEDs. Who this helps: This benefits researchers and manufacturers developing advanced light-emitting technologies.

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This study looked at creating strong, tiny porous coatings made from zinc oxide and aluminum oxide, which can be used in sensors and medical devices. The researchers found that aluminum oxide can be made more effectively than zinc oxide, with four times better infiltration into the polymer templates. They also discovered that these coatings can withstand extreme temperature changes without damage, and that heating them improves their hardness without affecting their overall structure. Who this helps: This benefits engineers and scientists designing advanced materials for sensors and biomedical applications.

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This research studied a new type of coating made from a special material called PIM-1, which is used to create thin, durable layers that reduce glare on surfaces like screens and lenses. The coatings have around 50% air-filled spaces, making them light and effective, cutting down reflections on sapphire surfaces to just 0.1% at certain wavelengths, which is much lower than typical coatings. These strong coatings, with high resistance to scratching and a thickness of less than 200 nanometers, are promising for use on high-end optical devices and might also protect other coatings from damage. Who this helps: This benefits manufacturers of optical devices, like smartphones and high-end cameras, as well as users looking for clearer screens.

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This study examined how artificial intelligence (AI) can predict how long patients will stay in the hospital after neurosurgery by analyzing their electronic medical records. The AI predictions were accurate, with an error of just 2 days compared to what doctors and patients expected, which is similar to the accuracy of doctors’ predictions. This is important because it can help hospitals manage resources better and improve care for patients. Who this helps: This benefits patients and hospital staff by optimizing planning and resource use.

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This study looked at how removing a polymer template affects the shape and characteristics of iron oxide nanoparticles in mixed materials. Researchers found that using heat or plasma to remove the polymer led to different shapes of nanoparticles: heat produced solid particles, while plasma created hollow ones. These shapes matter because they change the magnetic properties of the materials, which can be crucial for various applications. Who this helps: This helps researchers and manufacturers in developing advanced materials for technologies like data storage and sensors.

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This study looked at a new method for creating thin, porous films made of zinc oxide (ZnO) that are good at detecting ethanol. Researchers successfully made these films with very accessible pores, achieving up to 98% pore availability, which allows for effective sensing. This matters because these ZnO films can detect ethanol more sensitively, especially at lower temperatures, making them useful for applications like breathalyzers or environmental monitoring. Who this helps: This helps patients, doctors, and industries that need accurate ethanol detection.

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This study looked at how adding a magnetic element called vanadium (V) to a semiconductor material (BiTeI) affects its electronic properties. The researchers found that the energy gap at a specific point (called the Kramers point) increased as more vanadium was added, reaching a peak at 3% concentration, before starting to decrease again. This is important because it helps us understand how to control the magnetic properties of materials used in advanced technologies like quantum computing. Who this helps: This helps researchers and engineers developing future technologies in spintronics and quantum computing.

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This study looked at the surgical treatment outcomes for patients with narrowed or blocked arteries in the neck and brain at a neurosurgical center over 20 years. Out of 2,527 patients, 3,098 surgeries were performed, with a success rate showing favorable outcomes in 87.6% of cases and a very low mortality rate of 0.5%. These findings highlight the effectiveness of personalized surgical approaches in improving patient outcomes for those suffering from serious artery problems. Who this helps: This helps patients with artery blockages and their doctors.

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This study looks at how tiny particles called CdSe nanocrystals come together to form larger structures known as supercrystals. Researchers found that these supercrystals have areas that shine in different colors when exposed to light—specifically, some parts glow orange (around 585 nm) while others glow green (around 570 nm). This difference in color relates to the condition of the nanocrystals, which could help in understanding materials for applications like solar cells or medical imaging. Who this helps: This research benefits scientists and engineers working in fields like nanotechnology and materials science.

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This study investigated how nanoparticles (tiny particles) arrange themselves in ring patterns while drying in a specific shape called a toroidal drop, which is shaped like a doughnut. Researchers found that this drying process is different from the more common hemispherical shape; specifically, as the rings grow larger, the space between them becomes narrower in the toroidal shape, while it widens in the hemispherical shape. These findings are important because they enhance our understanding of how to create better materials for technology applications like sensors and catalysts. Who this helps: This helps researchers and manufacturers working on advanced materials and coatings.

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This study looked at whether amantadine sulfate could help patients with ischemic stroke recover better than standard treatments. Out of 95 patients, those who received amantadine showed improvement in certain recovery measures, especially in those with milder strokes. Although the overall results didn't show significant differences for all patients, those with less severe strokes had better outcomes, which is important for future research. Who this helps: This helps patients with mild ischemic strokes and their doctors in deciding treatment options.

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Researchers studied how swelling a specific type of polymer film affects its ability to absorb inorganic materials. They found that when the polymer template was swollen, the resulting materials were significantly better: the alumina films created were 192 nanometers thick and contained twice as much alumina and four times more pore volume compared to unswelled films. This matters because it enhances the design of advanced materials with improved properties for a variety of applications. Who this helps: This helps materials scientists and engineers developing advanced materials.

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This study looked at how the number of ligands—molecules that coat nanoparticles—affects the structure and behavior of superlattices made from nanoparticles. Researchers found that if there are fewer than 1.8 ligands per square nanometer, these structures collapse into disordered clusters, but with more ligands, they can maintain their ordered structure even when subjected to very high pressures (around 40-55 GPa). This is important because it means we can better control the properties of these materials for use in energy applications. Who this helps: This benefits researchers and engineers working on advanced materials for energy technologies.

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This study looked at a new type of material called Gd-doped topological insulators, which exhibit unique magnetic properties when studied with various techniques. The researchers found that this material has a magnetic phase that occurs at very low temperatures (4-8 K) and develops a surface magnetic layer at higher temperatures (30-100 K). This is important because understanding these magnetic behaviors may lead to advancements in electronic devices, particularly those that rely on magnetic and topological properties. Who this helps: This research benefits scientists and engineers working on advanced materials for electronics.

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This study looked at how blood flow in the brain changes in patients with blocked carotid arteries or a condition known as moyamoya disease after a specific type of surgery called an extracranial-intracranial bypass. Researchers followed 112 patients and found that the blood flow direction and amount improved after the surgery in 86 cases (77%), with 108 bypasses (96.3%) functioning successfully. Understanding these changes is crucial because it helps doctors choose the right surgical approach, leading to better recovery outcomes for patients. Who this helps: Patients with blocked carotid arteries and moyamoya disease.

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This study explored a new method for creating highly porous materials that contain tiny particles of metals, which can help with chemical reactions. Researchers successfully produced particles about 4.3 nanometers in size, made primarily of palladium oxide, that stay stable even at temperatures of 800 °C and are well-distributed within a porous structure. This is significant because these materials can efficiently catalyze the breakdown of gases like methane and carbon monoxide, making them useful for environmental applications. Who this helps: This benefits researchers and industries working on pollution control and waste management.

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This study looked at how the lack of oxygen in the brain can be used to create gold nanoparticles directly in living brain tissue. The researchers found that when the brain is low on oxygen, it can produce these nanoparticles from a salt solution nearby, which can help to balance the brain's chemistry. This discovery matters because it opens the door to new treatments that could manage brain health during oxygen shortages. Who this helps: This benefits patients with brain conditions related to low oxygen levels.

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This study looked at how certain liquids that don't mix with solvents (called non-solvents) affect the creation and structure of tiny particles known as nanoparticles. The researchers found that these non-solvents change the thickness of the outer layer of the nanoparticles and the way they crystallize. For example, smaller nanoparticles initially formed one type of structure but later changed to a different one, while larger nanoparticles maintained a consistent structure throughout. This is important because it helps scientists choose the right combinations of solvents and non-solvents to improve the purification process of nanoparticles, which can enhance their effectiveness in various applications. Who this helps: This helps researchers and manufacturers working with nanoparticles in medicine and technology.

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This study looked at how cleaning up CoPt3 nanoparticles (tiny particles made of cobalt and platinum) affects their structure and performance in chemical reactions. Researchers found that after extensive purification, these nanoparticles changed shape, losing some cobalt and forming a thick platinum shell around a core, which improved their ability to catalyze hydrogenation reactions by over 50%. This matters because it reveals that the effectiveness of these nanoparticles in chemical processes is not just about having a clean surface but also about their new structure. Who this helps: This helps chemists and engineers working on catalysts for various chemical reactions.

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This study examined how the size and shape of nanocrystals made of cadmium selenide (CdSe) and cadmium sulfide (CdS) affect the creation of defects during their growth. Researchers found that when CdS was added to smaller, round CdSe cores, there were few defects, while larger, elongated cores caused a lot of strain and many more defects. This matters because reducing defects can improve the efficiency of these materials in applications like solar cells and LEDs. Who this helps: This helps researchers and manufacturers of semiconductor materials.

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This study looked at new types of materials called hollow nanoparticles made from certain metals, which can help improve a specific chemical reaction necessary for producing oxygen. Researchers found that these nanoparticles could produce a current density of 10 mA/cm² at a voltage of 0.30 V, which indicates they are effective at facilitating the oxygen production process. This is important because it offers a cheaper alternative to using precious metals in renewable energy technologies. Who this helps: This benefits scientists and engineers working on sustainable energy solutions.

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This study focused on improving the accessibility of tiny pores in alumina films, which are important for various applications like purification and sensing. Researchers found that even when 20% of the surface was blocked, 60% of the pores remained open for solvent access, thanks to the high interconnectivity of the pores. This enhanced accessibility means these materials can be more effective in tasks such as detecting humidity. Who this helps: This benefits scientists and engineers developing new sensing and purification technologies.

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This study looked at a new method called sequential infiltration synthesis (SIS) to create very thin surface coatings that can bend light in specific ways. The research found that the refractive index of a coating made from aluminum oxide (AlO) can be reduced from 1.76 to as low as 1.1, which helps decrease reflections on surfaces like glass to just 0.1%. This is important because it can improve the performance of optical devices and glasses by making them clearer and reducing glare. Who this helps: This helps doctors and patients by improving optical devices such as glasses and medical imaging equipment.

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The study focused on a patient with severe blood flow issues to the brain caused by blockages in both the carotid and vertebral arteries. During surgery, the doctors successfully created a bypass and removed a blockage while using a temporary device to keep blood flowing, preventing further complications. This approach is important because it helps improve blood flow to the brain without increasing risk during the surgery. Who this helps: This benefits patients with complex artery blockages who need safe surgical options for improving blood circulation to the brain.

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This study explored a new method for creating nanoporous coatings, which are useful for applications like clean water and energy production. The researchers developed a technique called plasma-enhanced sequential infiltration synthesis (PE SIS) that allows for the production of these coatings under milder conditions, able to create films up to 5 micrometers thick. This method can be used on various surfaces, even those sensitive to water, making it a versatile option for manufacturing porous materials. Who this helps: This benefits researchers and companies working on advanced materials for environmental and energy applications.

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This study looked at the effectiveness of a specific brain surgery for patients suffering from chronic cerebral ischemia, which occurs when blood flow to the brain is reduced due to blocked carotid arteries. Researchers analyzed 404 surgeries performed on 376 patients and found that 53% experienced improvement after the surgery, while 43% had no significant changes, and 4% worsened. The success rate of the surgery varied from 22% to 79%, and factors such as patient age and the characteristics of the blocked arteries played a crucial role in determining the outcomes. Who this helps: This benefits patients with chronic cerebral ischemia who may be considering surgery.

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This study looked at how adding certain substances (called dopants) to tiny particles made of iron can change their properties. Researchers discovered that when iron particles oxidize (or rust), it helps the dopant, molybdenum, get inside the iron particles, making them more stable and responsive to changes. For example, when a specific dopant was present, the process of making iron and iron oxide particles became quicker, and the iron particles were much more resistant to oxidation. Who this helps: This research benefits scientists and engineers working to develop better materials for technology and medicine.

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This study looked at how excitons, which are important for energy transfer in certain materials, move in a type of nanomaterial called quantum dot superlattices made from CdSe. The researchers found that excitons can travel about 125 nanometers in a short time frame of 3 nanoseconds, and they measured a diffusion rate of approximately 0.025 cm²/s, which is significantly better than in disordered films. Understanding how excitons move helps improve the design of materials for better performance in technologies like solar cells and LEDs. Who this helps: This benefits researchers developing new optoelectronic devices.

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The study looked at how gold grows on seeds made from platinum or its alloys at a very small scale. Researchers found that this growth creates a lot of stress, around 2 gigapascals, which causes the structures to change shape from a core/shell design to a dumbbell shape. Understanding these changes is important because it helps control the properties of these advanced materials for various applications. Who this helps: This helps researchers and engineers developing new nanomaterials for a variety of uses.

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Researchers developed a new way to quickly detect botulinum neurotoxin (BoNT), a dangerous substance. The new method can identify the toxin in just 5 minutes and can detect it at very low levels—between 20 and 40 picomoles—outperforming the traditional mouse test, which takes about 2 days. This quicker, simpler test is important because it can potentially improve safety and response times in scenarios where the toxin poses a threat. Who this helps: This helps patients and emergency responders who need fast diagnosis in cases of botulinum toxin exposure.

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This research examined how gold nanoparticles interact with a specific type of semiconductor nanorods made from cadmium selenide and cadmium sulfide when exposed to UV light. The study found that the gold nanoparticles cause similar effects on light emission in the nanorods regardless of the presence of UV light, indicating that the gold-sulfur sites on the surface trap electrons very quickly, in less than 3 picoseconds. This understanding is important because it can improve the design of devices that use these materials in solar energy and optoelectronics. Who this helps: This helps researchers and engineers developing advanced materials for solar cells and electronic devices.

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This study focused on improving the heat management of lithium-ion batteries by using a special type of material called multiwalled carbon nanotubes in battery electrodes. Researchers found that these enhanced electrodes could conduct heat significantly better, achieving thermal conductivity levels up to 141 W/mK compared to traditional materials, which improves battery performance and safety. This is important because better thermal management can help prevent overheating and prolong battery life, making batteries more reliable for various applications. Who this helps: This benefits battery manufacturers and users, including electric vehicle drivers and consumers of portable electronics.

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This study looked at hollow nanoparticles made of iron oxide to see what’s inside them. Researchers found that the inside of these nanoparticles is mostly empty but contains small fragments of iron or iron oxide. They determined that the shells of these nanoparticles are solid and do not allow gases or liquids to pass through. Who this helps: This benefits researchers developing nanoparticle-based technologies, as it shows how these materials behave under different conditions.

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This study looked at how stable a material called lithiated cubic titania is under high pressure and how that stability changes with different amounts of lithium. The researchers found that as more lithium is added, the pressure needed for the material to change from a solid to a more fluid state increases significantly; for example, it rises from about 17.5 GPa without lithium to over 60 GPa when fully lithiated. This is important because it can improve our understanding of how certain materials behave under pressure, which is crucial for developing better energy storage technologies. Who this helps: This benefits researchers and engineers working on advanced battery technologies.

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This study looked at new types of materials made of tiny particles that combine magnetic metals (FePt) with semiconductor materials (CdSe and CdS). The researchers found that these materials have a high ability to conduct electricity, highlighted by electron mobilities of 3.4 and 0.02 cm²/V·s. This is important because it could lead to advances in electronic devices that use less energy and work more efficiently. Who this helps: This benefits engineers and scientists working on developing better electronic devices.