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ChinaSpaceflight的照片 - 微相册
镜头捕获女人_VIPER的照片 - 微相册
F/A-18
090422-F-7824S-969.JPG (1950×3014)
彩虹熊_白玮的照片 - 微相册
V-22
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NASA Astronaut Jasmin Moghbeli runs on a treadmill while wearing a bungee harness that prevents her from floating away. Moghbeli seems focused while her hair floats above her. Several cords are near the ceiling.
Epps is wearing a long-sleeved black top and pants, a black headband, goggles, and blue latex gloves and has a tablet attached by Velcro to her pants. In her right hand she holds a small metal disk with six 3D printed posts of different shapes and lengths
A view from above shows Williams, wearing a black t-shirt, khaki pants, and white latex gloves, floating next to the Life Sciences Glovebox. The box, the size of a dorm refrigerator, has a silver metal base and glass sides above it. There are arm holes on
Moghbeli, wearing a dark blue hooded sweatshirt, smiles at the camera. Next to her is an open, cube-shaped plant growth facility, with small tomato seedlings growing in multiple rows on the bottom. Multiple hoses and cords are visible on the back and side
O’Hara smiles at the camera through the glass of a glovebox. Her arms are inside the glovebox sleeves, and she wears blue latex gloves. A clear, rectangular sample plate floats between her hands.
Close-up view of an experimental setup featuring an array of circular material samples mounted in a black panel with metal screws. The samples include various reflective, metallic, and translucent materials, such as silver, gold, and transparent surfaces.
Best of Space Station Science Images 2024 - NASA : Crew members on the International Space Station conducted hundreds of experiments during 2024, ranging from human research to Earth science and technology demonstrations.
NASA astronaut Nick Hague is inside the International Space Station performs a scientific experiment. The astronaut, wearing a black T-shirt and beige pants, is handling equipment, including a metal grid container and a cylindrical device. The interior of
Best of Space Station Science Images 2024 - NASA : Crew members on the International Space Station conducted hundreds of experiments during 2024, ranging from human research to Earth science and technology demonstrations.
Best of Space Station Science Images 2024 - NASA : Crew members on the International Space Station conducted hundreds of experiments during 2024, ranging from human research to Earth science and technology demonstrations.
NASA astronaut and Expedition 72 Flight Engineer Nick Hague pedals on the Cycle Ergometer with Vibration Isolation and Stabilization (CEVIS), an exercise cycle located aboard the International Space Station's Destiny laboratory module. CEVIS provides aero
View from outside a large run stall. The 100-foot-long X-59 sits in the run stall with the engine and the rest of the back of the aircraft sitting outside the run stall’s open bay door.
Hague, wearing a gray t-shirt and smiling at the camera, is inside the cupola with hardware for the Rhodium Plant LIFE investigation. To his right floats the hardware, a shiny gold box that holds six glass sample tubes with a white sticker that says “Rhod
NASA Astronaut Suni Williams floats inside the International Space Station with her hair extending outward due to microgravity. She is interacting with the Astrobee robotic assistant featuring two articulated blue robotic arms attached to a cube-shaped de
An astronaut in a pool
A close-up of damage to NICER’s thermal shields
A close-up of NICER
An astronaut practicing in a pool
Photo of a man in a spacesuit in a pool.
An astronaut in a pool
SpaceX : SpaceX designs, manufactures and launches advanced rockets and spacecraft.
SpaceX : SpaceX designs, manufactures and launches advanced rockets and spacecraft.
5a5bc2ddgy1fz4wuz9wl8j20u018y4qp.jpg (1080×1618)
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@LeoLiArt 的个人主页 - 微博
石英晶振(石英晶体谐振器)是在电路中十分常见的一种器件,利用石英晶体高度稳定的压电-谐振特性产生精确的频率来提供处理器或时序电路需要的时钟节拍。通常这些小器件是金属外壳封装的,不过也有一些采用了漂亮的玻璃外壳,因此可以一窥其内部的结构。据说玻璃外壳相比金属外壳,在高真空下放气更少,能保持晶体内部环境的高度清洁,此外透过外壳可以检查封装是否良好,通过激光微调频率等。最后2图是石英晶体振荡器(有源晶振)的结构,可以看到石英片和它下面的振荡电路芯片,这种器件通电即可输出稳定且幅度强的频率信号,无需外部电路。
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