Chinese Scientists Make Breakthrough in Replacing WiFi With LiFi

CHANGCHUN, Oct. 3 (Xinhua) — Chinese scientists have made a breakthrough in creating full-color emissive carbon dots (F-CDs), which brings them one step closer to developing a faster wireless communication channel that could be available in just six years.

Light Fidelity, known as LiFi, uses visible light from LED bulbs to transfer data much faster than radio wave-based WiFi.

While most current research uses rare earth materials to provide the light for LiFi to transmit data, a team of Chinese scientists have created an alternative — F-CDs, a fluorescent carbon nanomaterial that proves to be safer and faster.

“Many researchers around the world are still working on this. We were the first to successfully create it using cost-effective raw materials such as urea with simple processing,” said Qu Songnan, an associate researcher at Changchun Institute of Optics, Fine Mechanics and Physics, the Chinese Academy of Sciences, which leads the research.

Qu said rare earth has a long lifespan which reduces the speed of LiFi transmission. However, F-CDs enjoy the advantage of faster data transmission speeds.

In previous studies, carbon dots were limited to the emission of lights such as blue and green. The new nanomaterial that Qu’s team has developed can emit all light visible to the human eye, which is a breakthrough in the field of fluorescent carbon nanomaterial.

Qu said this is significant for the development of LiFi, which he expects to enter the market in just six years.

A 2015 test by a Chinese government ministry showed that LiFi can reach speeds of 50 gigabytes per second, at which a movie download can be completed in just 0.3 seconds

Source: Xinhua

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Lighthouse in South China Sea is operating now

The lighthouse on Zhubi Reef in the South China Sea is now in use. XING GUANGLI / XINHUA

China turns on lighthouse on man-made island

China’s Ministry of Transport on Tuesday held a completion ceremony for the construction of a lighthouse on Zhubi Reef, marking the start of its operation.

Beijing rebuffed suspicion on Wednesday over the operation of a lighthouse on an island in the South China Sea, saying it is a public service that China is providing to the region.

“China has been committed to providing more public products and services to navigation in the South China Sea. It is beneficial to the trade of coastal countries in the region and even some countries outside the region,” Foreign Ministry spokesman Lu Kang told a regular news briefing.

The Ministry of Transport held a completion ceremony on Tuesday for construction of the lighthouse on Zhubi Reef, marking the start of the lighthouse’s operation.

Construction of the 55-meter-high lighthouse, which has a lantern of 4.5 meters in diameter on top and rotating lights inside, began in October. The lighthouse is monitored via a remote control terminal.

The lighthouse emits white light in the nighttime, with a range of 22 nautical miles and a glow cycle of five seconds.

Zheng Heping, deputy head of the Maritime Safety Administration, said the automatic identification system and other equipment inside the lighthouse can provide efficient navigation services to ships, such as positioning reference, route guidance and navigation safety information.

To improve maritime emergency responses in the area, the Ministry of Transport started construction of large, multifunctional lighthouses on Huayang Reef, Chigua Reef and Zhubi Reef last year. The two other lighthouses are already in use.

“The Zhubi lighthouse will further enhance the capability to ensure maritime security in the South China Sea,” Zheng said.

“The lighthouse is a very advanced one with multiple functions,” said Zhang Xuegang, an expert on Southeast Asian studies at the China Institutes of Contemporary International Relations.

He said the lighthouse will provide information about hydrology and weather, including typhoon warnings, to passing vessels.

“It can also provide waterway information, such as which channels are busy,” he added.

He suggested having rescue personnel live on the island.

Li Jinming, a professor of maritime policy and law at Xiamen University, said the lighthouses that China has built in the South China Sea are a testimony to its efforts to safeguard navigation freedom and security.

“The US, Japan and the Philippines have challenged China on that. And the glowing lighthouse is a silent answer.”

Lighthouses are part of China’s efforts to perform its responsibilities in maritime search and rescue, response to natural disasters and marine environmental protection, the Transport Ministry has said.

By Li Xiaokun China Daily/Xinhua

Light shines brightest when it is dark

THE one time I felt really scared in an unfamiliar physical environment was many years ago when my friend and I got lost in Taman Negara.

Because of a wrong turn, what was to be a simple two-hour track to a riverside lodge took us nearly eight hours. The jungle was getting really dark. The leeches were having a feast. And the sounds of wild animals in the distance made us shiver in our pants.

We eventually found our way to the lodge and quickly lit a kerosene lamp we had brought with us.

In the heart of the deep jungle, the light was truly reassuring. After a dinner of delicious instant mee and a tin of sardines, we turned down the lamp and lit some candles to illuminate the lodge.

Those of us who live in towns may not fully appreciate the beauty of a lit candle in the midst of total darkness. But it is really true that light shines brightest in the dark.

Life is not all sunshine. There are times when we feel like we are walking through very dark valleys.

It could be due to the loss of a job, the death of someone very dear to us, or a recurrent illness where treatment seems to bring more problems than the disease itself.

At times like this, it is only natural that we yearn to see the light.

A person lost at sea is encouraged when he sees the beacon of light coming from a lighthouse. It signifies hope. But the light that we seek at times like this is not necessarily from a physical source. It can come in the form of someone who is prepared to drop everything to help us navigate through our tough times.

It could be someone willing to listen to you, with a box of tissue nearby, without saying a word.

I have, in the past few weeks, felt like I was walking through a very dark valley with no end in sight.

But it is always when I am at the lowest ebb that something invariably happens – a light shows up to brighten up my life.

Last week, I went to see my dentist and told her I would be a real challenge to her this time.

My mouth can hardly open. And from what the doctors tell me, and my own research on the Internet, this is one of the most troublesome side effects of radiotherapy and chemotherapy.

I have been having trouble eating, and even brushing my teeth is difficult. I wondered how my dentist would be able to use her tools to fix whatever problems she could find. But she patiently went to work, and spoke to me gently with reassuring words.

The session lasted close to two hours and she managed to do five fillings. It was amazing!

She told me not to lose heart over my mouth issue. Take things one day at a time, she said. “You will be fine.”

And when I went to pay, the clinic assistant smiled and said: “Doctor says no charge.”

Though my dentist knew I could afford the bill, she must have wanted to do something to cheer me up.

It was not about the money, but a reminder that I do not walk alone.

I won’t deny her the opportunity to be the giver, and for me to be the blessed recipient. There is joy in both giving and receiving, if done in the right spirit.

I got into my car and tears just streamed down. I had a good cry before I made my way back to work. Suddenly, the dark valley I had been walking through in recent weeks didn’t seem so dark after all.

By SOO Ewe Jin

Executive editor Soo Ewe Jin appreciates being on the receiving end of kind words, sincere fellowship and heart-to-heart conversations, underscoring the fact that the best things in life are not only free, but priceless.

The views expressed are entirely the writer’s own.

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