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From the grove to the sky: Chinese team develops drone made of bamboo-based composites_我的网站

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    Newly released wartime records from the Hailar branch of Japan's notorious Unit 731. Photo: Xinhua
Newly released wartime records from the Hailar branch of Japan's notorious Unit 731 reveal how the Japanese military disguised biological warfare personnel as conventional infantry troops to conceal secret operations, including human experimentation. 
The Exhibition Hall of Evidences of Crime Committed by Unit 731 of the Japanese Imperial Army released on Wednesday a 185-page archive of "personal background declaration" from the Hailar branch of Unit 731, also known as "Manchuria Unit 543". The documents show that the Japanese military concealed its biological warfare operations under the guise of conventional infantry units and shed new light on the Soviet Union's continued efforts after World War II to investigate and prosecute Japanese biological warfare crimes. 
Unit 731 was a top-secret biological and chemical warfare research base established as the nerve center for Japanese biological warfare in China and Southeast Asia during WWII. At least 3,000 people were used in human experiments conducted by Unit 731, and more than 300,000 people in China were killed by Japan's biological weapons, according to the Xinhua News Agency.
The Japanese Kwantung Army established five branches of Unit 731 in Northeast China - in Hailar, Sunwu, Mudanjiang, Linkou and Dalian. Located in the northeastern part of the Inner Mongolia Autonomous Region, near China's borders with Mongolia and the Soviet Union, the Hailar branch served as a frontline base of the Japanese imperialist army for potential biological warfare operations against the Soviet Union.
The newly released 185-page archive contains key information on 156 members of the Hailar branch of Unit 731, including their names, military ranks, dates of enlistment, duties, transfers and postwar whereabouts. Researchers said the documents constitute first-hand official records for studying the branch's personnel structure and operations. 
Jin Shicheng, a researcher at the Exhibition Hall, said the study produced two major findings. First, the documents reveal that the Japanese military recruited personnel under the cover of ordinary infantry units to conceal biological warfare activities. Some personnel, for example, were recruited under the names of conventional units such as Manchuria Unit 97, Unit 177 and Unit 201. They were then sent to Unit 731 headquarters for three months of training before being assigned to the Hailar branch. The deceptive recruitment system was intended to conceal the crimes committed by Unit 731, including human experimentation.
Moreover, the archive provides evidence of continued postwar investigations into Japanese biological warfare crimes. Of the 156 personnel listed in the documents, 145 were captured by Soviet forces after the war and detained in the Soviet Union. Four were tried in Khabarovsk between April and September 1950. The researcher said the records show that Soviet investigations and judicial efforts concerning Japanese biological warfare crimes continued after the trial held in 1949.
    A photo published by Xinhua showed a record on medic Tanizaki Hitoshi in the "personal background declaration" records of Unit 731's Hailar branch. Photo: Xinhua
A photo published by Xinhua showed a record on medic Tanizaki Hitoshi in the "personal background declaration" records of Unit 731's Hailar branch. Tanizaki, originally named Ozaki Hitoshi, is documented in historical records that, together with his oral testimony, form a chain of evidence further substantiating the crimes committed by Unit 731.
Experts said the new revelation of the Hailar branch deepens research into Unit 731 and, together with previously obtained oral testimony from former members, form a broader chain of evidence. The official records exposed the efforts by the Japanese military to disguise their crimes against humanity and provided further evidence of the state-organized system behind Japan's biological warfare program, while adding important material to research on Unit 731 and postwar prosecutions.
Global Times 
。         A drone made of bamboo-based composite materials is seen in flight. Photo: official WeChat account of Long BambooA Chinese team has developed a drone using bamboo-based composite materials after making a breakthrough in a technique that allows bamboo to be flattened while preserving its tough outer layer. The drone has completed multiple test flights, China Central Television (CCTV) News reported.
Long Bamboo, a company based in East China's Fujian Province, developed the technique that preserves the bamboo's tough outer layer and allows different parts with different densities of the material to be used according to their properties, improving its overall performance.
In the past, the outer skin of bamboo was often treated as leftover material and eventually burned into low-value bamboo charcoal.
According to a company release in February, bamboo-based composites now make up more than 25 percent of the entire drone, while its fuselage skin is made entirely from the company's own high-performance bamboo composite material.
The bamboo-based material also offers a major cost advantage, costing only about one-quarter to one-tenth as much as aviation-grade carbon fiber. After the drone is retired, the material can naturally degrade, allowing it to effectively "come from nature and return to nature."
The team spent four years building data models, upgrading equipment and refining the material. The resulting drone has a wingspan of more than 2.5 meters but weighs only about 7 kilograms, and has already completed multiple test flights, according to CCTV News.
Bamboo was traditionally used mainly in products such as tableware and furniture. Now, however, the material is finding its way into a wider range of industrial applications. Bamboo fiber is being used in automobile interiors, while bamboo-based materials are also being explored as possible substitutes for plastics, glass fiber and carbon fiber in some applications. 
China has the world's largest bamboo resource base, with about 7.56 million hectares of bamboo forests nationwide. The country also ranks among the world leaders in bamboo resources, bamboo cultivation technologies and the development and utilization of bamboo materials, per CCTV News.
Global Times 
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