Scientists develop new spacecraft outer protective materials

The academician team of Yu Shuhong, China University of Science and Technology, developed a new type of spacecraft outer protective material – polyimide-nano-macular composite film. This new material has been significantly improved due to its unique bionic design, and its mechanical properties and extreme environmental tolerance are significantly improved, which is expected to replace existing polyimide-based composite film materials. This results have been published in "Advanced Materials".

The polyimide film is a perfect material of the space detector "protective clothing" due to its excellent mechanical properties, excellent thermal stability and protruding chemical resistance. However, like other hydrocarbon polymers, the material is extremely susceptible to atomic oxygen attack in the space environment, causing its physical and mechanical properties to drop sharply, and there is currently no good solution. In addition, cosmic radiation and space debris impact also bring severe tests to their stability.

Yu Shuhong team is inspired by natural pearl mother’s "brick-mud" layered structure, using the pre-mechanical properties and ultraviolet mask function and can be prepared as a structural element, with polyimide precursor The polyimide-nanocomposite film is co-assembled, and the superior intrinsic characteristics of mica make up for the lack of polyimide. Different from the conventionally imitation pearl layer nanocomposite film, researchers have double-layer pearl layer structures by changing group distribution ratios, with a two-layer pearl layer structure, with a more dense nammother piece. This design strategy not only achieves effective improvement in material mechanical properties, but also facing atomic oxygen, ultraviolet radiation and spatial debris or the like.

Studies have shown that the tensile strength, Young’s modulus and surface hardness of this novel bionic composite film are 125 MPa, 2.2 Gpa and 0.37 GPpa, 45%, 100%, respectively, 100%, respectively, 100%, respectively, 100%, respectively, 100%, respectively, 100% And 68%, its performance is significantly better than the polyimide-mica composite film of the pure polyimide film, a single layer of pearl mother structure, and a polyimide-based composite containing conventional reports. In addition, its anti-ultraviolet aging and high temperature stability are also significantly improved.

The industry believes that this research proposed unique double imitation pearl mother structure design strategy, providing new ideas for designing other high-performance nanocomposites. (Guiyun An)

Tarban users encounter back thorn? Huawei Matebook E is sold, 5899 yuan two in one more

This year, the panel is estimated to be more than a lot of people’s imagination, and even some brands that have not been panel are also involved. Is the tablet really become a productive tool? In fact, regardless of Apple Tablets or many Android brands, it is almost meant. Wintel is the unrequited alliance in the field of productivity. Now it is estimated that some users who buy tablets will regret it, because Huawei Matebook E two products are sold, it seems that this is the product we want.

Huawei’s previous generation Matebook E product is still two years ago, and the above-in-one product is a real ARM tablet, with ARM customteral Windows 10 system, and there is not too much advantage. But now, Huawei’s new replacement products use Core i5-1130G7 processor, and I7 options, entry-level configuration is 8GB memory + 256GB combination, with keyboard case, if you want mainstream, you can choose 16GB + 512GB, it is both a flat, or it can be used as a notebook.

Huawei Matebook E This product is X86 two-in-one tablet. In fact, the evaluation of the monarch has experienced before listed, and the product is very smooth. It seems that it seems that the original Microsoft is so layout. In terms of performance, 11 generations of cool Rui is enough for daily office, and there is no noise in the experience, and the heat is almost similar to ordinary tablets, but because it is the X86 platform, with the handwritten pen and keyboard protective cover can instantly change back to notebook form It is also very practical.

Huawei Matebook E uses a 12.6-inch OLED screen that supports DCI-P3 color gamut. The maximum brightness has reached 600nits. The aspect ratio is 16:10, and the resolution is 2560 × 1600. This screen can bring a very good picture of the daily office or audio and video entertainment. The entire flat host has only 7.99mm thick, and only 709 grams of weight is also used as a flattening. The external keyboard has a touchpad and a smart voice button as an additional input device, and NFC can support multi-screen coordinating, which is all available.

In addition, this tablet is also equipped with Huawei M-Pencil handwritten pen, due to a separate Bluetooth channel connection, the lowest delay is only 2ms, the writing experience is very good, and global control is also supported. The flat panel also joined Huawei mobile application engines, which can run a lot of mobile apps directly, which also makes this flat-compatibility better. If it is not severely used, it can even replace the light and become a office platform.

As for the price, the current Huawei Matebook E series tablet started 5899 yuan started, Core i5-1130G7, 16GB memory, 512GB SSD This kind of access to the tablet and notebook is 6899 yuan, the higher-end Core i7 version is 7899 yuan. In fact, the first two gears are more good choices. After all, a product can be solved in the same time, and the price is only a little more expensive than the high-end tablet. I believe it is acceptable. It is estimated that many small partners who bought tablets may give priority to this product, can only say that Huawei is too sudden, no one wants.