Students studying for exams at Phan Chau Trinh High School (Da Nang). The key knowledge in the high school graduation exam is in the 12th grade Chemistry program, the number of questions related to the 11th grade program is very small and mainly combined with the general knowledge question. Reinforce basic theory Ms. Huong said: Chemistry is an experimental science with a large amount of knowledge, ranging from theory at the level of awareness and understanding to exercises at a high level of application and application. According to Ms. Huong, from qualitative to quantitative exercises, experimental questions to questions related to economic, social, and environmental issues… most students focus on conquering Quantitative exercises with the desire to achieve high scores in the exam but forget that quantitative exercises only account for 25% of the exam structure (about 10 questions/40 questions of the Chemistry exam). Click on the image to view the content. “Students should have a more realistic view of the exam questions, thereby increasing the amount of time to review and consolidate basic theory into a fixed source of capital for themselves before each exam,” Ms. Huong said. In addition, Ms. Huong illustrates the learning method for the knowledge content on metal corrosion, metal preparation in the metal outline section. Systematic knowledge to grasp includes: Corrosion of metals and metal processing. Specifically, metal corrosion is the destruction of metal or alloy due to the action of substances in the surrounding environment (M > Mn + + ne). In particular, metal corrosion has two forms: chemical corrosion and electrochemical corrosion. Chemical Corrosion: Corrosion reaction does not generate electric current. And electrochemical corrosion: Corrosion reaction simultaneously generates electric current. Electrochemical corrosion occurs when in a material there are different electrodes, in contact with each other and placed in an electrolyte environment. Rust (corrosion of cast iron and steel objects in moist air, acid …): Fe-Anode (-): Fe > Fe2+ + 2e (Oxidation) C-Catot (+): O2 + 2H 2O + 4e > 4OH– (Reduction) Or: O2 + 4H+ + 4e > 2H2O Rust generation reaction: 2Fe + 3/2O2 + nH2O > Fe2O3.nH2O The similarity between chemical corrosion and electrochemical corrosion is the oxidation – reduction process. But chemical corrosion does not generate electric current, metal corrodes slowly; while electrochemical corrosion generates electric current, metal is corroded quickly. For metal protection against corrosion, there will be two methods of surface protection: Isolate metal from the environment by coating the metal surface with environmentally sustainable substances such as grease, paint, and plating. metal, enameled; also electrochemical protection that binds a metal to another more active metal. For example, attaching zinc to the steel hull (submersible part) will corrode the zinc and protect the hull. Preparation of metals, the principle of reducing metal ions to metal atoms (Mn + + ne > M). With methods of electro-treatment, heat-treatment and hydro-treatment. Formula for expressing Faraday’s law: (according to the number of moles of electrons exchanged). m: Mass of substance collected at the electrode (g) A: Molar mass of the substance obtained at the electrode (g/mol) n: Number of electrons exchanged I: Amperage (A) F: Faraday’s constant (F = 96500) Students need to draw connections, simple ways of remembering when doing related types of work. For example how to solve the question package about metal modulation methods like: Which of the following metals can be prepared by hydrometallurgy? A. Ca. B. Na. C. Mg. D. Cu. Which of the following metals can be prepared by solution electrolysis? A. Ag. B. Na. C. Ba. D. Al. You can use diagrams for this type of question like this: K, Ba, Na, Mg, Al – Zn, Fe, Ni, Sn, Pb, Cu, Hg, Ag, Pt, Au Molten electrolysis Solution electrolysis, heat treatment, hydrometallurgy. The way to do the test effectively is to calmly read the exam questions. Hundred or used manually Ms. Huong said: When reviewing, students need to remember the principle “Hundred or not with familiar hands”, repeating information as much as possible, the deeper the memory, the easier it is to recall. So do as many exercises as possible. When doing the test, there must be a relationship of knowledge, good points, and skills that need to be applied to each type of post; exchange materials with friends and teachers. Click on the image to view the content. “For lessons on mainstream theory, students need to master the definition and concept, understand the essence of that definition and concept, and know how to apply it to solve related questions. For the lesson on quality, candidates need to firmly grasp the name, properties, relationship between structure and properties, and practical application”, Ms. Huong said. According to Ms. Huong, in order to solve chemistry exercises, students first need to master the theory, then practice more skills in applying theory to specific exercises, problem analysis skills, and using tricks. calculate… According to Ms. Huong, the effective way to do the test is to calmly read the exam questions. With the form of theoretical questions, quickly read through the sentences to see the answers immediately, the questions are left to do later. With the question type of counting the number of true/false statements, in each statement should note the points in the topic. wrong, exception, it will be more convenient for you to check your work again. With the form of quantitative exercises, which sentences are familiar, have been met and done first. Which sentences are difficult and novel to do later and when done, you should combine looking at the answer because some sentences can be easier to navigate from the answer.

Nathan Copeland controls a robotic arm using electrodes implanted in his brain. Published in the journal Science, the team say their work demonstrates that adding sensation to the technology significantly improves the function of prostheses for quadriplegics, compared with based solely on visual cues. Nathan Copeland, 34, told AFP: “I am the first person in the world to have a device implanted in the sensory cortex that scientists can use to stimulate my brain directly. And then, I felt like I had a real feel in my flesh and blood hand.” In 2004, Copeland was involved in a car accident that left him with a severe spinal cord injury and quadriplegia. He volunteered for scientific research and six years ago he underwent major surgery to implant tiny electrodes in his brain. Two sets of 88 electrodes the width of a human hair are arranged like tiny combs and penetrate deep into the cortex, which controls motor function. According to Associate Professor Rob Gaunt of the Department of Physical Medicine and Rehabilitation at the University of Pittsburgh, co-leader of the study, fewer than 30 people in the world have received such a transplant. What’s unique about Copeland’s case is that an additional set of electrodes is connected to his dorsal cortex, which receives and processes sensations. The idea of ​​sending haptic feedback to the tactile sensory cortex dates back decades, but doing so in a controlled and understandable way by brain circuitry used to be a major challenge. After Copeland underwent surgery to install the electrodes, the team was truly thrilled. Then came the decisive moment, when they tried sending the first tactile signal. “It felt really fuzzy,” Copeland recalls. He asked them to try again to make sure it was real. Before the interface could work with the robotic arm, the scientists had to perform a series of tests on Copeland. First, they needed to learn which electrodes cause what sensation when activated and which fingers are associated with them in order to set up the robotic hand correctly. They also made him watch a video of the robotic arm moving left or right and recorded the electrodes lighting up when he was asked to “think” it was him controlling it. Copeland sat next to a black metal robotic arm and was asked to pick up a series of small objects such as rocks and spheres and place them in a box – when the tactile sensors were turned on or off. He can complete each task in an average of twice as fast when the sensors are activated, and can even perform more complex tasks like picking up a glass and pouring its contents into a glass. another cup. The team wanted to further refine the prosthetics because they didn’t want to just do science experiments in the lab, but wanted to actually make devices that would be useful to people. Copeland has set up his brain-computer interface at home when the Covid-19 pandemic shut down universities and has used his downtime to learn how to draw on a tablet and even play video games. death. He does this by using his mind to send signals directly to the computer, instead of using his arms to press buttons.

This product is called “bamboo wife” and it is popular in Southeast Asia, especially in hot weather. It is hollow, made of bamboo and a little shorter than a person. It helps people have a comfortable sleep, when hugging this product, you will not be hot. Product “bamboo wife” Anti-Aging Mask This is an invention from Japan, it is a contraption made of rubber according to the manufacturer, a simple and effective anti-aging device. It lifts the cheeks and makes the face appear slimmer. A shaping mask This is a popular mask in Japan used to reshape the face. The face is said to become smaller. The masks are made from a material that wicks away perspiration and makes your face slimmer. Single-wheeled shipping products This isn’t a chair but a super small, 1-wheeled Honda U3-X transporter. It can move in any direction thanks to its Omni-Traction drive system. The wheels are made of multiple autonomous wheels that allow you to move left and right without turning. It is still not sold in regular stores but we hope it will be popular. Nose lifting tool This looks like a torture device but in reality it is just another Japanese device called a nose lift device. It changes the shape of the nose, eliminating bumps without surgery. It creates a vibration that stimulates the bone in the nose and changes it. It takes time because the device works gradually: you need to wear it for 3 minutes a day. Mask “Rejuvenique” This mask is called “Rejuvenique”, despite its intimidating appearance, made for facial care. It has electrodes that have the same effect as surgery, according to the manufacturer. Emotion tracking mask This is a next-generation device: it’s an amazing (and scary) silicone mask that can track emotions and change accordingly. It has a tracker to measure the activity of the facial muscles. So when a person is frowning, smiling and so on, the mask moves a particularly colorful liquid through its vessels. Hair wave machine Does this look like an alien device? It was very simple: this was a wave machine in 1939. Back then, this wavy hairstyle was very popular and every woman wanted it, so it is not surprising that such a device was invented. Guitar Pikasso A jazz musician asked a Canadian man to make a guitar with as many strings as possible. The quest seemed strange but it was completed. The guitar is called the “Pikasso Guitar” for a reason as it reminds us of famous paintings by Picasso. The instrument can make many different sounds: it can be like a bass guitar, an acoustic guitar and a harp all in one. In this video you can see the jazz musician who made an unusual request to play this amazing instrument. Cushions If you have to sit a lot at work, this is an invention you definitely need. According to the manufacturer, this mattress will help you relieve back pain, keep blood circulation healthy, and maintain a comfortable temperature to avoid sweating.

On each microprocessor there are billions of transistors and nm (nanometer) – the unit of measurement of transistor size. The smaller the size, the more transistors the processor can hold, making it faster and more efficient. TSMC’s most advanced chip today uses a 5 nm process with about 173 million transistors per square millimeter. Silicon chip wafers in TSMC’s production line. Photo: TSMC. This breakthrough was discovered by the MIT team, with components optimized by TSMC and improved by NTU. The core component uses semi-metallic bismuth as the electrode of a two-dimensional material to replace silicon, allowing for reduced resistance and increased amperage. Energy efficiency will thus rise to unprecedented heights in the semiconductor industry. Chipmakers have been trying to stuff more and more transistors into increasingly smaller chips, but are nearing the limits of silicon-based technology. That prompted scientists to look for two-dimensional materials to replace silicon to produce chips on the 1 nm process or smaller. More transistors on a chip gives manufacturers more options to deliver core innovations to improve performance for leading tasks like AI and cloud computing, and pave the way for better security. Encryption and encryption are performed by hardware. The need to increase performance and save energy in each processor has never cooled down, especially in the era of the cloud, AI, and IoT. Most of today’s chip-integrated devices use 10 nm or 7 nm process technology. The two largest chip manufacturers in the world, TSMC and Samsung, are launching chips with the 5 nm process, while Intel is still at the 7 nm stage. TSMC also only plans to start moving to the 4mm process later this year before mass production in 2022.

While today’s most advanced technologies can produce chips as small as 3 nm, the new technology will “break the limits of Moore’s law”, said Chih-I Wu, Professor from NTU and co-author of the paper. research said. Moore’s Law can be broken by TSMC’s sub-1 nm chip manufacturing technology. Photo: Reuters. One of the obstacles when it comes to improving the chip manufacturing process lies in the structure and choosing the right materials. According to the Tom’s Hardware , shrinking the chip size but denser transistors can increase the resistance at the electrodes, affecting the performance. Research shows that using bismuth as an electrode significantly reduces resistance, increasing transistor amperage. Currently, TSMC’s technology uses tungsten as the electrode, and Intel’s cobalt. TSMC’s sub-1nm chip manufacturing technology is still being tested before mass production in the next few years. Alternatively, further studies may consider using a different electrode material instead of bismuth. Discovered in 1965 by Intel co-founder Gordon Moore, Moore’s law has become the rule for the advancement of semiconductor technology. According to this law, the number of transistors on a chip will double every 2 years, while the power consumption is halved. Over the years, chip companies around the world have continuously invested in semiconductors, a technology field that is considered a key future. In early May, the US company IBM introduced the world’s first 2 nm chip manufacturing technology. This process can quadruple smartphone battery life, cut data center carbon emissions, speed up laptops, and support high-performance artificial intelligence (AI). China is also looking to catch up with the US in semiconductors, amid technological advances that could cause Moore’s law to break. According to the SCMP , the Chinese government has proposed a five-year plan, referring to the potential semiconductor technology “post” Moore’s law. What if humans had chips in their brains Elon Musk creates an AI-powered device that interacts with the human brain. But is that really a good idea?

The software helps to record the thoughts in the brain into writing on the computer. The combination of mental effort and modern technology has allowed a motionless man (T5) to communicate by text at a speed comparable to that of healthy colleagues texting. on smartphone. Study participant (T5) almost lost all mobility below the neck because of a spinal cord injury in 2007. The scientists placed two brain-computer interface chips, each about the same size. an aspirin pill, on the left side of T5’s brain. Each chip has 100 electrodes that pick up signals from trigger neurons in the motor cortex, an area on the outermost surface of the brain that governs hand movements. Those neural signals are sent over wires to a computer, where artificial intelligence algorithms decode the signal and infer the T5’s intended hand and finger movements. Algorithms were designed in Stanford’s Neural Prosthetic Translation Lab. T5 generated text at a rate of about 18 words per minute (the average person can say about 23 words per minute on a smartphone). Even, T5 then reached a record of 40 characters per minute. The study was published online May 12, 2021 in the journal Nature. It offers hope to hundreds of thousands of Americans and millions around the globe, who have lost the ability to use their upper limbs or speak due to spinal cord injury, stroke or amyotrophic lateral sclerosis.

Removes water-soluble dirt Dr. Do Huu Quyet, Center for Research and Deployment of High-Tech Park in Ho Chi Minh City, said that CDI is a Capacitive Deionization (CDI) capacitance technology, derived from the super absorption technology of supercapacitors. CDI water filtration technology has been certified to meet the standards at the TQC Quality Testing and Certification Center and meets the national technical requirements of TCVN 11978: 2017. “The development of supercapacitor technology in recent years has created electrodes that can store large amounts of electrical charge in their hearts. Applying the same principle, if one considers water a solution where 99% of the substances are electrolytes (including toxic substances, micronutrients, dissolved salts …), one can give a stream of Light electricity runs through the water. Use electrodes to absorb the dissolved substances from the water and store on the plate for the pure water to pass through. When the electrode is full of electrolytes, it can reverse the current to release harmful substances and use another small stream of water, causing the electrode to return to its original state. Under ideal conditions, the poles can be charged 1 million times while still retaining 80% of the performance. The discharge – charge properties are similar to the supercapacitors that the water filter elements can work continuously with a very long lifespan, up to 5 – 10 years, ”said Dr. Quyet. Drinking water must provide essential nutrients such as sodium, potassium, calcium, magnesium, iron, iodine, phosphorus … If only using purified water according to RO technology completely will lead to a lack of minerals. Super absorbent water filtration technology will create mineral water, kill bacteria, safe for health. Electrostatic CDI water purification technology can separate salt and water-soluble chemicals to create a drinking water source that ensures essential mineral levels, good for health. Safe water does not contain harmful toxins such as pesticides, fertilizers, heavy metals, cancer-causing oxidants, neutral or slightly alkaline pH, no harmful bacteria and delicious taste. The filtration system is designed like other water filtration systems, the only difference is that the CDI filter element is located just below the tap. The structure of the filter core is essentially a lot of electrodes combined together to absorb dirt. In the water, heavy metal components are immediately attracted to these electrodes. Meanwhile, the mineral components will be retained flowing through the membrane filter to the tap. In addition, the CDI filter element also has a micro ultrafiltration filter that removes suspended substances. Because water is circulated in the same direction with the filter, there is no tearing of the membrane, causing bacteria and toxic substances to escape. In addition to retaining minerals, filtering toxins, killing bacteria, CDI technology also has a high filtration efficiency when retaining 70 – 95% of water, the amount of wastewater compared to RO technology is much smaller (from 20-25 % compared with 50-70%). Especially, CDI filtered water always has air particles formed by minerals, tastes delicious, easy to drink … Due to the nature of the electrodes that will absorb toxins, users can adjust the amount of minerals at will by adjusting the electric current on the machine. Increasing the voltage to the highest level will produce the output water as pure water, decreasing with each degree, the mineral content will increase according to the needs of the user. Provide safe water for hospitals, schools Dr Quyet said the team’s future intention is to build large-capacity brackish water filtration systems integrated into water treatment plants in the West. Most of the provinces here do not have factories that can handle this problem. Traditional technologies have proved ineffective because they are expensive and fail quickly. Meanwhile, people often have to buy fresh water at the price of 50,000 – 100,000 VND / m3 during the salty drought. The essence of RO technology is to squeeze water through a filter to retain salt and obtain a stream of pure water, with both salt and water molecules too small to be easily pressed through the membrane, so the filtration process will requires great pressure and consumes a lot of energy. As a result, RO technology creates waste water flow up to 40% – 70%. Although RO wastewater can be used for purposes with less stringent standards such as irrigation, washing, washing … but other water purification technology developers are still striving to earn billions. clean water rates for living as high as possible in the same cost range. Because the operating principle of CDI technology is to “pick up” particles of salt and toxic substances out of the water stream, Dr. Quyet said that the amount of wastewater disposed of is only about 5-10%. According to Mr. Nguyen Thanh Tuan, Director of Vietdream Technology Co., Ltd, the goal of the business is to provide optimal, safe and effective water filtration solutions for users. The company does not sell water purifiers but only supplies filtration technology to partners with needs such as buildings, hospitals, schools, businesses using high standards of water, water purification plants. small and medium scale, enterprises producing food and beverages … With the co-founding of a technology company named Vietdream to commercialize this new water purification technology, Dr. Quyet hopes to “produce CDI water filters to replace RO filters”. Although the initial investment cost of CDI technology can be 2-3 times higher than RO technology, due to the difference in membrane life and operating cost, the overall cost of the first year of these two technologies are being equal. Currently, 70% of materials for Vietdream’s CDI water purification technology have been localized, including electrodes made from carbon nanotubes and polymers, water filtration modules and control systems. This trend could be reduced if they build more efficient supply chains or become widely accepted by the market.

In their paper in the journal IEEE Trans Transaction on Biomedical Engineering, the team presented the results of trials on two men with spinal cord injury aged 35 and 63. The system works by connecting a signal generator on the user’s head to an electrode relay in the cortex, through the connection port like wired systems. From there, the tester can move, click and type on the computer keyboard with his or her brain. Transmitter connects to a relay located in the brain cortex, helping people to use wireless computers. Photo: BrainGate. In the test, both candidates were able to achieve typing speed and click accuracy on par with a wired system. At the same time, they can use the system continuously for up to 24 hours at home. “The signals are recorded and transmitted with the same fidelity as a wired system, meaning we can use the same decoding algorithms that we have,” said John Simeral, who leads the team. used with conventional wired equipment ”. “The only difference is that we are no longer physically tied to the devices, which opens up new possibilities for future research,” Simeral added. “With this system, we are able to look at brain activity at home, over the long term, in a way that was previously almost impossible,” said Leigh Hochberg, another team member. This gives us more opportunities to create algorithms that allow people with paralysis to move and work. ” According to the Mashable, The aforementioned study is a significant step forward in the field of neural communication, in which the human brain is directly connected to the computer. Recently, big names in the tech world like Facebook and Elon Musk have also expressed interest in this area. Simple device is placed on top of research candidate. Photo: Radiofiji. In 2020, Elon Musk’s startup Neuralink introduced a pig named Gertrude, with a computer chip implanted in the brain. Or, as before, in 2021, the company also succeeds in implanting a chip into the monkey brain so that the animal can play video games. However, Brown University’s first human study demonstrates that the technology can be used wirelessly, and it wouldn’t be surprising if we find wearable devices that allow people with disabilities to communicate with them. continue and work better in the future.

Many world-famous models, actors and athletes have applied EMS technology to practice to get a balanced body, healthy fitness or support recovery from injury. Currently, Europe alone has more than 6,000 gyms using this technology. Many benefits in just one machine The EMS training principle is based on the transmission of low-frequency electrical impulses to the muscle bundles through electrodes attached training suits. The impulses stimulate the muscles to contract on a natural reflex, similar to when exercising at high intensity. Compared to traditional training, EMS technology helps the practitioner impact muscle groups more comprehensively, from the outer to deep inside, stimulated by electrical impulses. From the special mechanism above, even without performing separate exercises with different tools for each muscle group, the practitioner still achieves high efficiency in fat loss and muscle building. Therefore, the time saved between a training session with EMS technology compared to a traditional gym is not small. A training session with EMS technology takes less than 25 minutes and only needs to maintain 2 sessions / week. As a result, this method is favored by people who are busy or unable to exercise vigorously such as office workers, business people, housewives, middle-aged people … Thanks to EMS technology, trainees only spend 25 minutes / training session, 2 sessions / week. According to research by Bayreuth University in Germany, after 6 weeks of applying EMS technology, 85% of trainees noticed a marked change in physique, slimmer body and firmer muscles. The study results also showed that training with full body EMS technology created 40% higher training intensity than traditional training with weights. Specifically, overall strength increased by 12%, while endurance and fitness improved by 69%. In addition, EMS technology is also considered to be a safe method of training because it does not need vigorous exercise or performing difficult exercises, so it can significantly eliminate the risk of injury. Practitioners just need to wear specialized outfits and perform some exercises with simple and easy to remember postures and movements. In addition, the electrical current of the EMS exercise machine is low frequency, so it does not create pain or cause the practitioner to lose a lot of energy. Along with reducing fat and gaining muscle, the electrical impulses from the EMS exercise machine also help the body boost metabolism. From there, the practitioner can improve blood circulation, eliminate accumulated toxins, strengthen the immune system and maintain a more relaxed, energetic spirit. This is also an ideal therapeutic support method for office workers, helping to reduce symptoms of neck and neck pain, back pain, and hernias by positively impacting the skeletal system and blood vessels. Besides improving physique, EMS technology also helps to reduce back pain, shoulder and nape. Become a favorite exercise model In recent years in Vietnam, EMS technology has been more applied to sports practice and has begun to receive great attention. In particular, 25 Fit is one of the pioneering centers to invest in applying this technology on a large scale with a methodical and professional operation according to the standards of modern EMS gyms in Europe. All gyms at 25 Fit are equipped with EMS exercise machines from Miha Bodytec firm. This is one of the first EMS Training equipment suppliers in the world to be certified by FDA (USA) for safety and quality standards. The machine consists of a control panel, a training shirt that integrates electrodes and an adapter cable that conducts electrical impulses, all designed to deliver high training efficiency and ensure user safety. In addition, each customer will get 25 Fit equipped with a functional clothes inside to maintain the moisture on the skin and help the electrical impulses be transmitted optimally. This garment is manufactured by Miha Bodytec from a fabric with modern technology and high antibacterial ability. 25 Fit’s EMS exercise machine meets FDA (USA) quality and safety standards. Besides EMS machine, before every training session at 25 Fit, customers will be trained by trainers to use pre-workout to replenish energy and increase endurance. At the same time, the trainer will carefully check the daily fitness index with the InBody machine to adjust the exercise and give advice to the customer to adjust the exercise regimen and nutrition accordingly. Coming to 25 Fit, trainees can also enjoy the luxurious and airy gym space; Use bathroom, private dressing room, fully equipped with modern equipment and amenities. In addition, the gym is also loved by customers thanks to its dedicated service attitude and professional working style from friendly staff and coaches with a smile on their lips. 25 Fit has 20 gyms in Ho Chi Minh City and Hanoi. Before the reception of customers, in less than 2 years, 25 Fit has expanded the system of more than 20 gyms in Ho Chi Minh City and Hanoi, expected to reach 30 gyms by the end of the first quarter and 100 rooms by the end of the year. now on. This achievement shows the brand’s efforts to bring EMS technology into the new training trend in Vietnam, helping busy people still have access to effective methods of fitness improvement and health care. science. With a serious investment, 25 Fit promises to become one of the leading companies in the gym model with relatively new technology in Vietnam. 25 Fit suggests appropriate methods of exercise and nutrition to help readers have a healthy and supple body. With 25 minutes of exercise per session, 2 sessions per week, 25 Fit’s EMS technology helps trainees lose fat, gain muscle effectively, and get in shape ready for summer. Readers follow detailed information https://25fit.net/?utm_source=zing&utm_medium=Content_Sponsor&utm_campaign=khoevui_trontet. https://25fit.net/?utm_source=zing&utm_medium=Content_Sponsor&utm_campaign=khoevui_trontet