Mostrando entradas con la etiqueta scientific. Mostrar todas las entradas
Mostrando entradas con la etiqueta scientific. Mostrar todas las entradas

A Chinese rocket, according to astronomers, is expected to crash into the moon on March 4. It is the latest example of China’s presence in space. News of the predicted crash comes after Beijing released a development blueprint for satellite improvements, deep-space exploration and putting more people in orbit.

Analysts expect Beijing to reach many of the goals outlined in its five-year plan for the development of outer space despite the odd mishap, according to experts.

China’s space program stands to rival those of Russia and the United States, especially in terms of commercializing space technology, they add.

“China is something to look at seriously in terms of increasing competitiveness,” said Marco Caceres, director of space studies at the Teal Group market analysis firm. “Part of that is that the U.S. was ahead by so much that countries like China, where their economies are growing faster, they’re simply catching up.”

Past meets future

China launched its first satellite in 1970 and put its first human in space in 2003, becoming the world’s third nation, after Russia and the United States, to reach that milestone. In 2019, China’s spacecraft made a historic landing on the far side of the moon. Beijing is in the process of adding onto its Tiangong space station later this year.

China is excluded from the International Space Station, a cooperative operation among Europe, the United States, Russia, Canada and Japan, due to U.S. national security concerns.

Over the next five years, Beijing’s space program will place people in space on “long-term assignments” for scientific research, complete findings on Mars and explore the Jupiter system, according to China’s Space Program: A 2021 Perspective.

The coming half-decade will see improvements as well in the capacity of space transport systems, and China will “continue to improve its space infrastructure” through integration of remote sensing, communications, navigation and satellite positioning technologies, the document says.

China will probably realize its five-year goals because it has been working on them for a decade or more, with plenty of government funding, analysts say.

The January report effectively “bundles” together what’s already taking shape, said Richard Bitzinger, defense analyst with the Defense Budget Project, a research nonprofit in Washington. It’s technically possible that China could mine ore on an asteroid, Bitzinger said, though the job would require complex anchoring and drilling work.

A lot of the blueprint goals are meant to exude peaceful intent and a positive international image, he added. “Most manned space programs are symbolic,” Bitzinger said. “From an economic sense, they’re a loss leader, but from a sense of demonstrating power, they’re perfect for that.”

The blueprint says future Chinese space missions will remain “peaceful,” despite suspicion in Washington that the Chinese space program will be directed toward military purposes.

Commercial momentum

Progress in the Chinese space program has allowed China to become what Caceres describes as more “aggressive” than the United States in marketing satellites and modern launch services. Its budget probably grows faster than NASA’s, he added. Chinese space-related gear can be found in Africa, Asia and Latin America, the analyst said.

Countries such as Australia and Japan already use Chinese space-based remote sensing data after natural disasters. Russia and China tentatively agreed in September to open a joint lunar research base.

“China calls on all countries to work together to build a global community of (a) shared future and carry out in-depth exchanges and cooperation in outer space on the basis of equality, mutual benefit, peaceful utilization, and inclusive development,” the Chinese Embassy in Washington told VOA on Wednesday.

Some of the countries closest to China geographically may still hold out for U.S. space technology despite China’s willingness to engage, said Alan Chong, associate professor at the Singapore-based S. Rajaratnam School of International Studies.

The government of Myanmar, for example, resents China over infrastructure debt and projects that people see as irrelevant to their lives, the U.S.-based Center for Strategic and International Studies has found.

“I think the situation is fluid, and I wouldn’t say that Southeast Asia will be comfortably in the Chinese orbit yet,” Chong said. “It has of course never been friendlier with China, over the past 15 years or so, but I think the game is not over for the United States.”

Three people who had suffered a complete spinal cord injury and were paraplegics can now walk thanks to an implant that stimulates the area of ​​the spinal cord that controls the muscles of the trunk and legs. It works from an application that incorporates artificial intelligence

A scientific breakthrough allows three paraplegics to walk and play sports


Michel Roccati, a patient suffering from paraplegia, walks through the Complex of the Federal Polytechnic School of Lausanne after receiving a spinal cord implant. EFE/Federal Polytechnic School of Lausanne/EDITORIAL USE ONLY

This technique, which uses ‘electrode paddles’ designed specifically for spinal cord injuries, has been developed by a Swiss team of researchers, which is part of an ongoing clinical trial showing that stimulation treatments specially designed for each patient , rather than more general ones, result in “higher efficiency and more diverse motor activities” even in the most severe spinal cord injuries.

As published on Monday in the journal Nature Medicine, Grégoire Courtine and Jocelyne Bloch, responsible for the experiment, confirm that electrical stimulation of the spinal cord is currently a promising therapeutic option to restore motor function in people with spinal cord injury.

But they point out that, until now, continuous electrical stimulation therapies have mostly been employed using “adapted” neurotechnologies, which were originally designed to treat pain.

From the Polytechnic Federal School of Lausanne (EPFL), which is part of the platform on which this scientific advance has been achieved, the neuroscientist Grégoire Courtine said that the new soft implants placed under the vertebrae in contact with the spinal cord “are capable of modulating the neurons that regulate the activity of precise muscle groups”.

“In this way -he added- we can activate the spinal cord as the brain would naturally do to stand up, walk, cycle or swim.”

three volunteers

Courtine and Bloch and their teams designed a new electrode palette that reaches all the nerves associated with leg and trunk movements, which they tested on three male volunteers aged 29-41.

The team also combined this technology with “a personalized computational framework, which allowed the electrode palette to be precisely positioned for each of the patients and to personalize the activity stimulation programs,” they explain.

An “optimized approach” to spinal cord stimulation restored the ability to walk independently and other motor activities, such as cycling and swimming, in a single day in the three patients, who have complete paralysis of the legs.

On this occasion, the key has been “to insert a longer and wider implant, with electrodes placed in such a way as to make them correspond precisely with the nerve roots of the spinal cord that allow us to access the neurons that control the muscles,” he explained. Bloch, at a press conference in which he showed the method and the results obtained.

Michel Roccatti

One of the first to receive this implant was patient Michel Roccati, an Italian who had a motorcycle accident four years ago and was left completely paraplegic, but who can now get up and walk with a walker in which two small remote controls are inserted.

A tablet sends the stimulation commands to a pacemaker located in Michel’s abdomen and from which the stimuli are transmitted to the spinal cord implant so that Michel gets up.

In a video provided by the EPFL, the patient is seen showing how this system works: a pressure on the button on the right side of his walker plus his will to activate his muscles make it possible for his left leg to flex and then rest a few centimeters more ahead. When activating the button on the left, it is the right leg that takes a step in turn and thus begins to walk.

This system has also allowed him to go up and down stairs.

“I use it daily for a couple of hours to walk outside and also in my house, so now it’s part of my daily life,” Michel recounted at the same press conference, who said that his next goal, which he hopes to achieve in a few months is to walk a kilometer in Lausanne, the city where he lives.

In the question and answer session of the press conference organized by the journal Nature Medicine, Bloch explained that the interventions to the patients who participated in the research were carried out at least one year after the injury was suffered, a period in which it is considered that his situation is stable and a maximum in recovery has been reached.

Age influences but does not exclude

With the data collected, it is believed that the sooner this technology is used after the injury, the better results can be obtained, said the surgeon at the University Hospitals of Lausanne.

He also commented that age has an influence on the result after receiving the implant: “In general, a younger patient is in better condition and is also more motivated, but we have seen patients up to fifty years of age who have responded well, as well that age is a factor that influences, but does not exclude.

Michel, the patient who agreed to offer his testimony, confirmed that with the use of this technology he is able to feel the contraction of specific muscles in his legs and abdomen when he receives stimulation.

paraplegic hospital
The person in charge of the Microscopy and Image Analysis Service of the National Paraplegic Hospital of Toledo, José Ángel Rodríguez, poses next to one of the images of the exhibition of the 12th anniversary of the research work. EFE/Ismael Herrero
Scientific American afirma que la reanudación de ciertas actividades

De acuerdo a lo señalado por la revista, gracias a la flexibilización de las normas sanitarias el país ha evidenciado un fuerte aumento de casos de COVID-19 durante el último mes.

24Horas.cl Tvn

06.05.2021

La jornada de este miércoles la revista estadounidense Scientific American, publicó un artículo relacionado al manejo de la crisis sanitaria en Chile, manifestado que «la imprudente prisa» por reabrir las escuelas y la reanudación de ciertas actividades durante el pasado mes de marzo, «amenaza la ejemplar estrategia de vacunación».

De acuerdo a lo señalado por la revista, gracias a la flexibilización de las normas sanitarias el país ha evidenciado un fuerte aumento de casos de COVID-19 durante el último mes.

«En marzo se reabrieron las escuelas y se permitió la reanudación de actividades de alto riesgo, como deportes de interior, gimnasios y casinos. Sin embargo, la reapertura fue prematura«, indicaron.

Si bien destacaron el rápido proceso de inoculación, donde uno de cada tres chilenos ha recibido ambas dosis, señalaron que «Chile también ha servido como advertencia sobre los peligros de la complacencia de las vacunas».

Asimismo, analizaron que el Gobierno ha eliminado sin problemas las restricciones a medida que se implementan los fármacos, lo que fue calificado como «un giro de 180 grados».

«Comenzamos a relajar los encierros y las medidas de distanciamiento social antes de que un porcentaje significativo de la población estuviera efectivamente inmunizado contra el COVID-19», declaró a la revista Juan Carlos Said, especialista en medicina interna del Complejo de Atención Sótero del Río en Santiago, Chile.

«Ahora nos encontramos en una situación en la que, aunque hemos vacunado a mucha gente, todavía no tenemos la pandemia bajo control», agregó.



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